Sheet Pan Fajita Veggies (Flavorful & EASY!)

What is the easiest way to make vegetables ready for fajitas? Bake them in the oven. It is a one-pot (I mean one sheet pan), no-mess, easy and quick method to make fajita veggies. More flavorful than the ones in Chipotle. BONUS – we included easy homemade fajita seasoning. So grab the recipe now!

Thumbs up for delicious Mexican comfort food! The first Mexican or Tex-Mex recipe on the blog was our favorite was this amazing meatless bean chili recipe. Then we added several delicious recipes like our quinoa sweet potato chili, our homemade grain-free tortillas, and these crispy oyster mushroom tacos.

Why you’ll love this recipe?

Fajita is a Tex-Mex, Texan-Mexican American dish that contains thin strips of beef skirt or chicken, bell peppers, chilies, and onions. They are all seasoned with a so-called fajita spice mix. They are either roasted, grilled, or pan-fried in a skillet.

You may wonder whether our recipe is a copycat Chipotle fajita veggies? No, this recipe is much more flavorful in comparison. Why? Because we use a 5-ingredient homemade fajita seasoning. And the popular Tex-Mex restaurant uses only 5 ingredients altogether: green bell peppers, red onions, oregano, sunflower oil, salt, and black pepper.

You’ll love our fajita veggies recipe for 3 reasons:

• It is packed with flavors.
• It is super easy and mess-free to make.
• You can make a huge batch in one go.

Ingredients

We use vegetables of all colors in combination to have a rainbow at the end. Here is what you need to make roasted fajita vegetables in the oven.

• Onions – red, or yellow
• Bell peppers – red, yellow, or green 
• Chili peppers – jalapeno, poblano, habanero, or serrano (if you like it hot and spicy)

That’s all you need if you want to keep it classic, I mean. So, no cherry tomatoes and no mushrooms. Just strips of roasted peppers and onions. 

Why did we add portobello mushrooms? 

You can use this recipe to make beef or chicken fajita, but as we are plant-based bloggers, we added some portobello mushroom slices instead of meat to make vegan fajitas (see below photo). And we added all of them to one sheet pan to make it super easy and quick.

Homemade fajita seasoning

There really are endless combinations for fajitas. In our eyes, fajita veggies should be spicy, smoky, and garlicky, but in any case with strong flavors. This is our favorite mix, which consists of FIVE spices:

• hot chili powder or chili flakes
• sweet smoked paprika
• cumin
• garlic powder
• oregano (or Mexican oregano if you can get your hands on it)

What if you don’t have the above ingredients? Don’t be so sad. If you have taco seasoning, you can use that instead. They are pretty close but taco spice mix has way more chili powder. If you grab a store-bought taco spice mix, you can see that chili is one of the first ingredients on the packaging.  

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

Prepare vegetables for fajita

How to cut onions?

1. Peel the onion.
2. Cut-off a little bit from both ends (stem and roots part).
3. First, cut it in half.
4. place the half onion on its flat side and make horizontal cuts of ¼-inch (4-5 mm) wide. See the result in the below photo.

How to cut bell peppers? 

1. Wash the bell peppers.
2. Lay one on its side and cut off the stem.
3. Cut it in half and take the seeds out.
4. Place the half pepper on its open flat side and make horizontal cuts of ¼-inch (4-5 mm) wide. See the result in the below photo.

Top tips

• If you have large bell peppers, you might want to cut the strips in half to be as long as the onion strips. 
• We had red, yellow, and green bell peppers. So we used all of them to make our fajita colorful, but obviously, you can use one color only. 
• If you work with hot chili peppers, make sure to wash your hand, knife, and cutting board thoroughly after. And don’t touch your eyes! 🙂

How to roast fajita veggies?

You can choose to roast them or grill them or sautee them. Our favorite method is roasting them in the oven.

Why? Because…

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

So let’s see the steps:

1. Mix your spices (hot chili powder, sweet smoked paprika, cumin, garlic powder, oregano) in a small bowl.
2. Place a parchment paper in a sheet pan and place the prepared fajita veggie strips on it.
3. Sprinkle them with olive oil and season them with half of the spice mix plus salt and black pepper. Mix them with tongs to make sure you cover all sides thoroughly.
4. Roast them in a pre-heated 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. Voila, your grilled fajita veggies are ready!

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 large 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 groups. – If they are grouped the ingredients separately, they will be easier to mix and match when you serve them. 
• Hot and sweet peppers together? – In case you prepare the veggies 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 them

After preparing and cutting your vegetables you can use other ways to get them ready

• Pan-fry them in a large cast-iron skillet, grill pan, or griddle on medium-high heat. We show you how to do it in our chipotle vegan burrito bowl recipe (see below photo) and also in our Mexican sweet potato rice bowl recipe.
• Grill them in aluminum foil drip pans* on your gas grill or charcoal grill.

Ways to use them

Fajita is a Mexican or Tex-Mex dish, therefore vegetables seasoned with fajitas spice mix go great with many delicious recipes: 

• Burritos (try our Copycat Chipotle Veggie Burrito)
• Burrito Bowls (try our Copycat Chipotle Veggie Bowl – pictured below)
• Tacos (try our Oyster Mushroom Tacos)
• Nachos / Tortilla Chips (add it to Loaded Nachos)
• Quesadillas (try our Hummus Quesadillas)
• Burgers (try our Epic Fajitas Portobello Mushroom Burger)
• Frittata (add it to Chickpea Flour-based Vegan Frittata)
• Breakfast Scramble
• Avocado Sandwich or Toast

Let us know in the comments what is your favorite way to eat grilled fajita veggies! May it be a meatless vegetarian dish or not, we’d love to know. 

Other toppings for fajitas

Whether you use flour tortillas to make a burrito or corn tortillas to make tacos, you can add many delicious sides to accompany your grilled vegetables. If we are talking about Mexican or Tex-Mex food, these sides are kind of staples to add: 

• Brown rice (or even quinoa) – we show you how to make easy cilantro lime rice in our vegan burrito bowl recipe
• Guacamole or avocado slices – we show you how to make guacamole in our vegan burrito bowl recipe
• Sour cream – we have a homemade vegan sour cream recipe if you need one)
• Black beans
• Crispy oyster mushrooms
• Copycat sofritas
• Salsa – we show you how to make tomato and corn salsa fresca in our vegan burrito bowl recipe
• Freshly chopped cilantro
• Lime juice
• Grain-free tortillas

Did we miss anything? Let us know. 

FAQs

How to store leftovers?

We recommend using an airtight container and store them in the refrigerator for up to 4-5 days. It keeps well in the fridge.

Can you make it ahead of time?

Roasted vegetables especially bell peppers and onions are perfect for meal prepping. Baking them in the oven will give you large batches that you can then eat through the week. If you want to meal prep burritos, for example, we recommend storing the ingredients and sides separately and only adding them to tortillas before you want to eat them. That way the tortilla will not soak up the juices from the roasted veggies and other sauces.

This Fajita Veggies recipe is meat-free, dairy-free, and egg-free. It is also suitable for vegan, vegetarian, paleo, soy-free, nut-free, and gluten-free diets. It can also be WFPB-friendly (whole foods plant-based) if you don’t use vegetable oil of any type.

More veggie side recipes

You can browse through our vegan gluten-free sides or check out

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UPDATED: This recipe was originally posted in January 2020. More tips, serving ideas, FAQs were added and it was republished in June 2022.