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    Home > Vegan Entrees

    Sheet Pan Portobello Mushroom Fajitas

    By Nandor Barta on 01/21/2024 - May contain affiliate links. Please read our disclosure.

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    This recipe for portobello mushroom fajitas is a delicious, meatless alternative to the classic fajita. With its spicy Tex-Mex flavor and a mix of colorful peppers, onions, and meaty portobello mushrooms, it is a quick and easy dish that will disappear from your table in no time.

    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.

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    If you enjoy this, you should also try my vegan portobello mushroom burger, chili-stuffed portobello mushrooms, and other recipes with portobello mushrooms.

    Jump to:
    • ❤️ Why you’ll love it 
    • 🧾 Key ingredients
    • 🥘 Equipment
    • 👩‍🍳 Instructions
    • 💡 Expert tip
    • 🔄 Variations
    • 🥣 Serving ideas
    • ❄️ Storing tips
    • More vegan Mexican recipes
    • Sheet Pan Portobello Fajitas

    ❤️ Why you’ll love it 

    I love how this recipe simplifies the process of making fajitas. The oven method for preparing the filling is not only easy but also ensures that all the ingredients are cooked to perfection. 

    The combination of bell peppers, onions, and portobello mushrooms seasoned with a homemade fajitas spice mix is so flavorful that you will not miss the meat. 

    What is best is that the variety of toppings, including guacamole, salsa, black beans, and vegan sour cream, adds an extra layer of deliciousness, making this a full-course meal. It is satisfying, delicious, and everything you could ever want in a home-cooked 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.
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    🧾 Key ingredients

    These portobello fajitas require only pantry staples for an irresistible flavor. You would be surprised how simple ingredients can result in such great taste.

    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

    Portobello mushrooms are the star of this dish, providing a hearty, meaty texture that is satisfying and filling. These large mushrooms are perfect for soaking up the flavors of the fajita spice mix.

    Red onion and bell peppers add a burst of color and a sweet, tangy flavor to the fajitas. They are sautéed until soft and caramelized, enhancing their natural sweetness.

    The homemade fajitas spice mix is a blend of hot chili powder, sweet smoked paprika, ground cumin seeds, garlic powder, and oregano. This homemade mix infuses the vegetables with a smoky, spicy flavor that is characteristic of traditional fajitas.

    Tortillas serve as the base for these fajitas. You can use store-bought tortillas or try my homemade flourless tortillas for a healthier, gluten-free option.

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

    🥘 Equipment

    For this delicious portobello mushroom fajitas recipe, the most crucial piece of equipment you will need is a sheet pan. This versatile kitchen tool allows you to roast all your veggies and mushrooms in one go, ensuring they are evenly cooked and full of flavor.

    👩‍🍳 Instructions

    Making the portobello mushroom fajitas

    STEP 1
    Preheat your oven to 430°F (220°C). While waiting, peel and slice the onion into ¼-inch (4-5 mm) wide pieces.

    STEP 2
    Wash and slice the bell peppers into ¼-inch (4-5 mm) wide pieces.

    STEP 3
    Rinse the portobello mushrooms if they are dirty. If they are clean, just gently wipe them with a damp towel. Cut off the stems and slice the mushrooms into ¼-inch (4-5 mm) wide pieces.

    STEP 4
    Place a sheet of parchment paper on a sheet pan. Arrange the sliced onion, bell peppers, and mushrooms on the pan, preferably in a single layer.

    Raw red yellow and green bell pepper slices nicely stakced next to each other on a black board.

    STEP 5
    Drizzle the vegetables with olive oil. Season them with half of the fajitas spice mix, salt, and pepper. Use tongs to mix the vegetables until they are evenly coated with the oil and seasonings.

    Red yellow green bell pepper and mushroom slices in a sheet pan seasoned with different spices before baking

    STEP 6
    Place the sheet pan in the preheated oven. After 10 minutes, remove the pan from the oven.

    STEP 7
    Turn the vegetables with tongs and sprinkle them with the remaining half of the spice mix. Return the pan to the oven and roast the vegetables for another 10 minutes. The vegetables should be served sizzling hot.

    Close-up of roasted brown crispy seasoned red, yellow, green bell pepper strips and mushroom slices after baking.

    STEP 8
    To assemble your fajitas, take a soft tortilla. Most store-bought brands are vegan. Place a few strips of mushroom, bell pepper, and onion in the middle of the tortilla. Top the vegetables with guacamole, salsa, black beans, and vegan sour cream. Enjoy your delicious vegan portobello mushroom fajitas.

    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

    💡 Expert tip

    To ensure your fajitas are packed with flavor, do not skip the step of seasoning your vegetables twice. First, season them before roasting, then again halfway through. This double seasoning ensures that every bite is bursting with the delicious fajita spice mix.

    🔄 Variations

    Bring in some different textures with tofu. If you want to add more protein to your sheet pan fajitas, why not include some crispy tofu? It will provide a unique texture and absorb the flavors of the fajitas spice mix. Remember to press the tofu before cooking to remove excess water and achieve a firmer texture.

    If you like your food with a bit of heat, consider adding some jalapeno peppers. These peppers will give your portobello mushroom fajitas a spicy kick without overpowering the other flavors. You can adjust the amount of jalapeno peppers according to your heat tolerance.

    Experiment with different types of mushrooms. The beauty of this recipe is its versatility. You can try using different types of mushrooms like shiitake, oyster, or cremini. Each type of mushroom will bring a unique flavor and texture to this recipe.

    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.

    🥣 Serving ideas

    Portobello mushroom fajitas is a versatile dish that can be enjoyed in many ways. You can add so many other delicious ingredients to take them to the next level.

    Serve it in some soft tortillas along with your favorite chunky salsa, some homemade fajita veggies, guacamole, black beans, sour cream, and of course lime and cilantro for a classic take.

    You can also experiment with different salsa flavors. Consider pairing them with a hot sauce or a fresh salsa. You can try a savory-sweet pineapple mango salsa recipe from Caramel and Cashews or the tomato corn salsa fresca in my burrito bowl recipe.

    Try different sauces to create a delicious flavor combination, such as our vegan queso dip or our vegan nacho cheese sauce. They will elevate the flavors of your portobello fajitas and make them pop.

    These fajitas pair well with a variety of vegetable sides. Try serving them with roasted bell peppers, sautéed onions, or julienned carrots for a refreshing and hearty 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. A hand is holding one.

    ❄️ Storing tips

    Storing and reheating portobello mushroom fajitas is easy, and it does not compromise the flavor.

    To store the leftovers, allow them to cool completely. Once cooled, transfer them to an airtight container and place it in the refrigerator. The fajitas should stay fresh for about 3-4 days.

    Unfortunately, freezing is not recommended for this recipe. The texture of the mushrooms and the vegetables can become mushy and unappetizing when thawed and reheated. Therefore, it is best to enjoy them fresh or refrigerated.

    When you are ready to enjoy them again, you can reheat them. Place them in a pan over medium heat, stirring occasionally until they are heated through. Alternatively, you can reheat them in the microwave, but remember to stir them every 30 seconds to ensure even reheating.

    🤔 FAQs

    Can I use other vegetables for the fillings?

    Yes, you can. This recipe is quite flexible. You can add other vegetables like zucchini, carrots, or even spinach. Just make sure to slice them thinly and adjust the cooking time as needed.

    What is the purpose of the fajitas spice mix?

    The fajitas spice mix adds a burst of flavor to the vegetables. It is a blend of hot chili powder, sweet smoked paprika powder, ground cumin seeds, garlic powder, and oregano.

    Can I make the fajitas spice mix in advance?

    Absolutely! You can make a larger batch of the spice mix and store it in an airtight container. It will stay fresh for up to 6 months.

    How do I assemble portobello fajitas?

    Start by placing a couple of mushroom strips, bell pepper, and onion slices in the middle of a tortilla. Then, add some guacamole, salsa, black beans, and sour cream on top. Fold the tortilla and enjoy.

    More vegan Mexican recipes

    If you love Mexican or tex-Mex recipes, I can surely show you plenty.

    • 3 small tortillas folded in half on parchment paper filled with mushroom shreds, corn, avocado slices, black beans drizzled with red and white sauce.
      Crispy Oyster Mushroom Tacos
    • A ligth brown ceramic dish with colorful ingredients like black beans, corn, rice, melted cheese, bell pepper strips, chopped avocado, chopped green herbs.
      Meaty Vegan Mexican Rice Casserole
    • A burger with ketchup, lettuce, yellow cheese sauce, bell peppers, guacamole and grilled mushroom cap on brown paper. French fries are placed next to it.
      Vegan Portobello Mushroom Burger

    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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    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

    Nandor Barta
    This recipe for portobello mushroom fajitas is a delicious, meatless alternative to the classic fajita. With its spicy Tex-Mex flavor and a mix of colorful peppers, onions, and meaty portobello mushrooms, it is a quick and easy dish that will disappear from your table in no time.
    5 from 3 votes
    Print Recipe Pin Recipe
    Prep Time 10 minutes mins
    Baking time 20 minutes mins
    Total Time 30 minutes 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 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
    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.
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      5 from 3 votes (2 ratings without comment)

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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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    Portrait of Emese and Nandi My Pure Plants

    Hi, we are Emese Maczkó and Nándor Barta, the founders and recipe creators behind My Pure Plants. We are sharing our knowledge and expertise in vegan recipes and encourage you to try home-cooked meals using locally-sourced, organic, whole foods.

    More about us →

    Reader Favorites

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