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    Home > Vegan Entrees

    Sheet Pan Portobello Fajitas (Vegan)

    By My Pure Plants on 09/05/2022 - May contain affiliate links. Please read our disclosure.

    Jump to Recipe Print Pin
    cropped-Oyster-Mushroom-recipes-featured-image.jpg

    Sizzling and spicy bell pepper, onion, and portobello mushroom strips will make truly delicious vegan fajitas together with guacamole, salsa, black beans, and vegan sour cream. I guarantee you that you will not miss any beef or chicken. It is quick to make, but even quicker to disappear. 

    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole. Leftover fillings in small bowls are around it.

    Hands up who loves Mexican or Tex-Mex food? We sure do. They burst in flavor, rich and colorful. Just look at our vegan bean chili recipe. So much color! Whether it is a burrito, a burrito bowl, some tacos, or these mushroom fajitas… they are perfect for a quick lunch or dinner. If you need even more quick and easy recipes, check out our quick vegan meals collection. 

    Table of Contents hide
    1. What to expect from this recipe
    2. Ingredients
    3. Instructions
    4. Top tips to make them perfectly
    5. What else can you add?
    6. FAQs
    7. Allergen info
    8. More vegan Mexican recipes
    9. Sheet Pan Portobello Fajitas (Vegan)

    What to expect from this recipe

    Fajita is Mexican or Tex-Mex comfort food. They serve it usually as a do-it-yourself meal. You get a sizzling hot cast iron with fajita veggies and beef or chicken strips and several small bowls of different toppings like guacamole, some kind of tomato-based salad or sauce, sour cream, refried beans, shredded cheese as well as some soft tortillas. You can then mix and match and fill the tortillas according to your taste. 

    This recipe is exactly the same minus beef and chicken of course. We show you the easiest way to make fajitas filling in the oven as well as how to make the various add-ins and toppings to make it a full-course meal. There are so many delicious ingredients here that you will not even realize that at the end you are eating a meatless meal.

    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole.

    Ingredients

    If you want to make portobello fajitas, you really don’t need to change or substitute a lot of things since apart from sour cream all other ingredients are usually vegan as they are. So what do you need?

    🛒 You can find detailed measurements for all ingredients in the printable version of the recipe card at the bottom of this post.

    Soft tortilla

    Let’s start with a tortilla. You need soft tortillas as fajitas are generally eaten rolled up or folded in half. Most of the store-bought wheat or corn tortilla brands are vegan.

    However, if you need vegan and gluten-free as well, we recommend trying these coconut flour tortillas or these multi-grain tortillas.

    We also have a homemade flourless grain-free tortilla recipe (made of red lentils and buckwheat) that we use a lot in different Mexican or Tex-Mex dishes. 

    Fajita veggies

    The ingredients of fajita veggies in different plates. The spices in small glass bowls, the colorful bell peppers slices on a black board. Purple onion slices in a wooden bowl. And mushroom slices one white plate

    You need bell peppers, onions and if you like it hot, then some chili peppers. We have a detailed guide on how to make fajita veggies the EASIEST WAY. It includes how to cut the vegetables, how to roast them, and how to make your homemade fajitas seasoning. If you only need a small batch (like dinner for two), you can find our step-by-step guide to pan-fry fajita veggies in our copycat chipotle veggie bowl recipe. 

    Mushroom strips

    There are several alternatives to choose from if you prefer whole foods substitution. Some of them will be closer to beef in terms of texture and taste, while some of them will be far from it. In any case, with strong spices and seasoning, you will like the meaty spongy texture of portobello mushrooms for sure.

    Alternatively, you can try it with oyster mushrooms. They are the best vegan shredded chicken ever.

    Toppings and add-ins

    Our favorite toppings for vegan portobello mushroom fajitas are

    • Guacamole – We usually make a copycat Chipotle guacamole.
    • Chunky salsa sauce – You can choose mild or hot depending on your taste. This brand should be vegan and gluten-free.
    • Black beans – We actually like using this canned black bean soup since the black beans there are even more flavorful. , 
    • Sour cream – We like to use Dr. Oetker’s vegan sour cream, but if you want a homemade recipe that is nut-free as well, try our vegan sour cream.
    • Lime
    • Cilantro
    Ingredients to build a mushroom fajitas is in small bowls like guacamole, mushroom slices, veggie slices, black beans, salsa, sour cream, lime and soft tortillas on a green plate

    Instructions

    Our favorite method to make vegan fajitas is roasting mushroom, bell pepper, and onion slices in the oven.

    Why? Because…

    • it is easy and has no mess, 
    • you can make a much larger batch than in a skillet, and
    • you can do other things in the kitchen while the oven is busy roasting. 

    For detailed steps, top tips, video, and more guidance visit our fajita veggies post.

    Prepare ingredients

    • Peel and slice onion ¼-inch (4-5 mm) wide.
    • Wash and slice bell peppers also ¼-inch (4-5 mm) wide.
    • Rinse portobello mushrooms if they are really dirty. Otherwise, just gently wipe them with a damp towel. Take out the stem and slice them also ¼-inch (4-5 mm) wide.

    Roasting veggies

    1. Mix your spices (hot chili powder like chipotle powder, sweet smoked paprika, cumin, garlic powder, oregano).
    2. Place parchment paper in a sheet pan and place the prepared mushroom, bell pepper, and onion slices on it.
    3. Sprinkle them with olive oil and season them with half of the spice mix plus salt and pepper. Mix with tongs.
    4. Roast them in a preheated oven of 430 Fahrenheit (220 degrees Celsius). After 10 minutes, take the sheet pan out, turn the veggies with tongs and sprinkle them with the other half of the spice mix. Roast them for 10 more minutes. 
    Red yellow green bell pepper and mushroom slices in a sheet pan seasoned with different spices before baking
    Before baking
    Close-up of roasted brown crispy seasoned red, yellow, green bell pepper strips and mushroom slices after baking.
    After baking

    Making guacamole

    We have several copycat Chipotle vegan recipes among others their burrito, their veggie bowl, their sofritas, and well their guacamole.

    Chipotle tweeted its guacamole recipe in May 2019. Here is how you can make it.

    1. Take one ripe avocado and mash it with a fork.
    2. Add lemon or fresh lime juice.
    3. Add finely chopped red onion and finely chopped fresh cilantro.
    4. Mix it well and season it with salt if needed.
    2 photo collage on how to make chipotle guacamole. The first shows the peeled avocado, the chopped onion, cilantro. The second shows everything smashed together.

    Building your portobello fajitas

    1. Take a soft tortilla.
    2. Place a couple of mushrooms, bell pepper, and onion slices in the middle.
    3. Scoop 2 Tablespoons of guacamole, salsa, black beans, and sour cream on top.
    4. Fold them up and enjoy!
    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole. Leftover fillings in small bowls behind it.

    Top tips to make them perfectly

    • Use a sheet pan with parchment paper. We recommend using a sheet pan because it has sides. If you use a baking sheet, the juices from the veggies during roasting might flow off of it. 
    • Cut veggies into equal strips. This is to make sure the vegetables are ready at the same time.
    • Place veggies in batches on the sheet pan. If they are grouped together, they will be easier to mix and match and serve. 
    • Hot and sweet together? – In case you prepare these portobello fajitas for kids or for people who don’t like spicy food, roast hot chili peppers separate from all other veggies. If you roast hot chili peppers and bell peppers together, the juices of the hot chili peppers may make the sweet bell peppers also spicy and hot.
    • Other ways to make fajita veggies. After preparing and cutting your veggies you can use other ways to get them ready like 1) Sautee them in a cast-iron skillet or grill pan or griddle or 2) Grill them in aluminum foil drip pans on your BBQ. -> In our vegan burrito bowl recipe, we show you with step by step pictures of how to pan-fry fajita veggies. 
    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole. Leftover fillings in small bowls are behind it.

    What else can you add?

    Well, there are lots of tasty things that come to my mind to add to these portobello fajitas:

    • shredded lettuce, 
    • shredded vegan cheese, 
    • hot sauce,
    • other fresh salsa, (here is a savory-sweet pineapple mango salsa recipe from Caramel and Cashews or this tomato corn salsa fresca in our burrito bowl recipe)
    • queso cheese dip, (try our vegan queso dip)
    • nacho cheese sauce, (try our vegan nacho cheese sauce).
    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole. A hand is grabbing one. Leftover fillings in small bowls are behind it.

    FAQs

    How to store them?

    You can store any leftovers in an airtight container in the fridge for 2-3 days without a problem. Reheat them in a pan or in a microwave.

    Can you freeze them?

    Yes, you can store it in a freezer. Make a larger batch ahead and froze them for later use. Thaw them and reheat them in a pan before serving.

    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole. A hand is holding one.

    Allergen info

    This vegan portobello fajitas recipe is meat-free, dairy-free, and egg-free.

    • Vegan – All ingredients are supposed to be vegan.
    • Nut-free – All ingredients are supposed to be nut-free but check for cross-contamination info on all packaging you need. Especially check the vegan sour cream you are about to use since a lot of brands uses coconut as a base. You can try our homemade sour cream recipe which is nut-free.
    • WFPB-friendly (whole foods plant-based) – You can roast vegetables without oil as well. Mix the spices with a bit of water instead of oil. Spread it around the slices and roast them like that. They will be a bit drier and will be easier to blacken. So pay attention to the baking time.
    • Gluten-free – Most soft and corn tortillas are vegan, but not gluten-free. We recommend trying these coconut flour tortillas or these multi-grain tortillas. Or try our homemade flourless grain-free tortilla recipe (made of red lentils and buckwheat) that we use a lot in different Mexican or Tex-Mex dishes. All other ingredients should be gluten-free but look for certified store-bought products for salsa, canned beans, and sour cream.
    • Soy-free – Especially check the vegan sour cream you are about to use since a lot of brands uses soy as a base. You can try our homemade sour cream recipe which is soy-free. All other ingredients are supposed to be soy-free.

    More vegan Mexican recipes

    • Crispy Oyster Mushroom Tacos
    • Meaty Vegan Mexican Rice Casserole in 30 Minutes!
    • Mexican Sweet Potato “Rice” Bowl
    • Epic Fajitas Vegan Portobello Mushroom Burger
    • Best Vegan Chili with Beans and Millet
    • Easy Quinoa Sweet Potato Chili (30 mins)

    THANK YOU so much for visiting our website. Please comment below if you have tried this recipe. We LOVE hearing from you! If you loved the recipe, please don’t forget to give us a ⭐⭐⭐⭐⭐ RATING. We appreciate all of our readers.  

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    ⇒ GET OUR FREE 7-DAY VEGAN MEAL PLAN E-BOOK NOW! OR CHECK OUT ALL VEGAN MEAL PLAN RECIPES! ⇐

    3 soft tortillas folded in half on a white blue plate filled with red pepper slices, purple onion slices and mushroom slices drizzled with white sauce, red salsa and guacamole.

    Sheet Pan Portobello Fajitas (Vegan)

    Nandor Barta
    Sizzling and spicy bell pepper, onion, and portobello mushroom strips will make truly delicious vegan fajitas together with guacamole, salsa, black beans, and vegan sour cream. I guarantee you that you will not miss any beef or chicken. It is quick to make but even quicker to disappear.
    5 from 3 votes
    Print Recipe Pin Recipe
    Prep Time 10 mins
    Baking time 20 mins
    Total Time 30 mins
    Course Main Course
    Servings 6 fajitas
    Calories 266kcal

    Equipment

    • Regular parchment paper
    • Microwave tortilla warmer
    • Metal taco holder

    Ingredients
     
     

    • 6 Small tortillas try our flourless red lentil tortillas

    Fillings

    • 1 Red onion (medium)
    • 3 Bell pepper (red, yellow, green)
    • 2 Large portobello mushrooms
    • 2+½ Tbsp Fajitas spice mix see below
    • 2 Tbsp Olive oil
    • Salt and Pepper to taste

    Homemade fajitas spice mix

    • ½ tsp Hot chili powder or flakes
    • 2 Tbsp Sweet smoked paprika powder
    • 1+½ tsp Ground cumin seeds
    • 1+½ tsp Garlic powder
    • 1+½ tsp Oregano

    Toppings

    • 6 Tbsp Guacamole
    • 6 Tbsp Salsa
    • 6 Tbsp Sour cream try our vegan sour cream
    • 6 Tbsp Black beans
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    Instructions
     

    Making the filling

    • The EASIEST way to make veggies for fajitas is in a sheet pan.
    • Peel and slice onion ¼-inch (4-5 mm) wide.
    • Wash and slice bell peppers also ¼-inch (4-5 mm) wide.
    • Rinse portobello mushrooms if they are dirty. Otherwise, just gently clean them with a damp towel. Cut the stems and slice them ¼-inch (4-5 mm) wide.
    • Place parchment paper in a sheet pan. Place all veggie and mushroom strips on it, preferably in one layer.
    • Sprinkle them with olive oil and season them with half of the fajitas spice mix, salt, and pepper. Mix them with tongs.
    • Roast them in a preheated oven of 430 Fahrenheit (220 degrees Celsius). 
    • After 10 minutes, take the sheet pan out, turn the veggies with tongs and sprinkle them with the other half of the spice mix. Roast them for 10 more minutes. Fajitas veggies are best served sizzling hot.

    Assemble your vegan fajitas

    • Take a soft tortilla. (Most of the store-bought brands are vegan)
    • Place a couple of mushroom strips, bell pepper, and onion slices in the middle of the tortilla.
    • Then scoop some guacamole, salsa, black beans, and sour cream on top. Enjoy!
    Tried this recipe? Can we see it?Please share a picture with us by uploading an image to Pinterest below ours.

    Notes

    • Use a sheet pan with parchment paper. We recommend using a sheet pan because it has sides. If you use a baking sheet, the juices from the veggies during roasting might not flow off of it. 
    • Cut veggies into equal strips. This is to make sure the vegetables are ready at the same time.
    • Place veggies in batches on the sheet pan. They will be easier to mix, match, and serve if they are grouped. 
    • Hot and sweet together? – If you prepare the veggies for kids or people who don’t like spicy food, roast hot chili peppers separate from all other veggies. If you roast hot chili peppers and bell peppers together, the juices of the hot chili peppers may make the sweet bell peppers also spicy and hot.
    • Other ways to make fajitas veggies. After preparing and cutting your veggies, you can use other ways to get them ready like 1) Sautee them in a cast-iron skillet or grill pan or griddle or 2) Grill them in aluminum foil drip pans on your BBQ.

    Video

    Nutrition

    Nutrition Facts
    Sheet Pan Portobello Fajitas (Vegan)
    Amount Per Serving (1 fajita)
    Calories 266 Calories from Fat 117
    % Daily Value*
    Fat 13g20%
    Saturated Fat 3g19%
    Trans Fat 0.002g
    Polyunsaturated Fat 3g
    Monounsaturated Fat 6g
    Sodium 413mg18%
    Potassium 541mg15%
    Carbohydrates 34g11%
    Fiber 7g29%
    Sugar 7g8%
    Protein 7g14%
    Vitamin A 3177IU64%
    Vitamin C 79mg96%
    Calcium 83mg8%
    Iron 3mg17%
    * Percent Daily Values are based on a 2000 calorie diet.

    UPDATED: This recipe was originally posted in Jan 2020. More tips, step photos, and info were added and it was republished in Sep 2022.

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    1. simon andrew

      February 04, 2020 at 7:25 am

      Its looks so yummm

      Reply
    2. Mr Tino

      February 03, 2020 at 9:57 am

      5 stars
      Thanks Emese and Nandi!
      Love this recipe with more create from your both.

      Reply

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