Zesty Vegetable Fajitas

These delicious vegetable fajitas are made with seared asparagus, portobello mushrooms, bell peppers and onions in a zesty cumin lime sauce!

White Wooden Surface Set with Skillet, Avocado, Water Glass, and Plate of Vegetable Fajitas

I’ve had my share of disappointing veggie fajitas, having ordered them at many-a-restaurant where they were the only meatless option. I usually get the impression that these fajitas are simply stuffed with the trimmings that would go in their regular fajitas…in other words, just onions and peppers with no seasonings.

Well these vegan fajitas are way better! I kept the usual onions and peppers, but also added a couple of my favorite veggies (asparagus and portobello mushrooms) and a zippy sauce, then topped them off with a sprinkle of cilantro and a slathering of guacamole. So good!


What You’ll Need

Bell Peppers, Asparagus, Red Onion, and Portobello Mushroom on a White Wooden Surface
  • Lime juice. Use fresh squeezed — it’s so much better than bottled!
  • Garlic.
  • Spices. We’re using cumin, chili powder, oregano, and paprika.
  • Salt & pepper.
  • Bell pepper. You can use any color pepper you like! I used half a red and half an orange.
  • Portobello mushroom. You’ll need one big one for this recipe. Sub a bunch of smaller mushrooms like button or cremini if you can’t find a portobello.
  • Asparagus. Try broccoli or green beans if you’re not into asparagus.
  • Red onion. A yellow or sweet onion will work in a pinch.
  • Tortillas. Look for small (fajita-sized) flour tortillas.
  • Fresh cilantro.
  • Sauce of choice. I love my fajitas with some guacamole, but hot sauce, salsa or cashew sour cream would also work well!

How to Make Vegetable Fajitas

The following is a detailed photo tutorial on how to make this dish. Scroll down if you’d like to skip right to the recipe!

  • Start by making your sauce. Stir the lime juice, garlic, spices, salt and pepper together in a small bowl or cup.
Hand Stirring Fajita Sauce Together in a Liquid Measuring Cup
  • Now time to cook the mushrooms. We’re cooking the mushrooms separate from everything else, because they need space and time to sit in the skillet undisturbed in order to brown.
  • Coat the bottom of the skillet with some oil and arrange mushroom slices in it in an even layer. Don’t crowd the skillet! Cook the mushroom slices in batches if needed — trust me, it’s worth it!
  • Cook the mushroom slices for about 5 minutes on each side, until they’re nicely browned.
  • Remove the mushroom slices from the skillet and transfer them to a plate.
Collage Showing Two Stages of Portobello Mushrooms Cooking in a Skillet
  • Now crank up the heat and add the rest of the veggies: asparagus spears, bell pepper slices, and onion slices.
  • Let the veggies sizzle for a few minutes, then flip them. Continue doing this until they darken in spots and become tender-crisp.
  • Return the mushrooms to the skillet. Pour the sauce over the veggies and flip everything a few times to distribute the ingredients.
  • Let the veggies cook for another minute or two, until most of the liquid from the sauce cooks off.
Collage Showing Two Stages of Cooking Fajita Veggies
  • Take the skillet off of heat and season the veggies with additional salt and pepper. Sprinkle everything with some fresh cilantro.
Close Up of Cooked Veggies in a Skillet
  • Warm up some tortillas, slather them with your choice of sauce, and stuff them with fajita veggies. Dig in!
Close Up of Vegetable Fajitas on a Black Plate

Variation: Grilled Veggie Fajitas

You can also cook these fajitas on a barbecue grill, and they’ll be awesome!

Simply oil your grill, use a medium flame and cook the veggies directly on the grill until they’re lightly charred and tender-crisp (about 5 minutes) brushing them with the sauce every few minutes.

Use your grill to warm up your tortillas as well. Just be careful not to overheat them or they’ll dry out!

Leftovers & Storage

Store any leftover veggies in a sealed container in the fridge for up to 3 days.

Frequently Asked Questions

Can these vegetable fajitas be made gluten-free?

Sure! Just use gluten-free tortillas.

Are these fajitas spicy?

They’re spicy, but not very hot. Add a bit of cayenne pepper if you’d like some heat in yours!

Can I substitute any of the vegetables in these fajitas?

Absolutely! Just make sure to substitute with veggies that have a similar texture and cook in about the same amount of time as those called for in the recipe. Broccoli might be a good substitute for asparagus, or eggplant might be a good sub for the mushrooms. Avoid watery veggies like tomatoes or leafy veggies like spinach.

More Vegan Mexican Recipes

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White Wooden Surface Set with Skillet, Avocado, Water Glass, and Plate of Vegetable Fajitas


Zesty Vegetable Fajitas

These delicious vegetable fajitas are made with seared asparagus, portobello mushrooms, bell peppers and onions in a zesty cumin lime sauce!
Course Entree
Cuisine American, Mexican
Keyword vegan fajitas, vegan mexican recipe
Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings 6 fajitas
Calories 182kcal
Author Alissa Saenz


  • ¼ cup lime juice
  • 2 garlic cloves, minced
  • 2 teaspoons ground cumin
  • 1 teaspoon mild chili powder
  • 1 teaspoon dried oregano
  • ½ teaspoon sweet paprika
  • ½ teaspoon salt, plus more to taste
  • ½ teaspoon black pepper, plus more to taste
  • 2 tablespoons olive oil, plus more if needed
  • 1 large portobello mushroom, cleaned and sliced
  • 8 asparagus spears, woody ends removed, then stalks cut in half
  • 1 medium bell pepper (any color), sliced
  • ½ red onion, sliced
  • ¼ cup chopped fresh cilantro
  • 6 small (fajita-size) flour tortillas, warmed
  • Guacamole, or sauce of choice


  • Stir the lime juice, garlic, cumin, chili powder, oregano, paprika, ½ teaspoon salt, and ½ teaspoon pepper together in a small bowl.
  • Coat the bottom of a large skillet with 2 tablespoons of oil and place it over medium heat.
  • Give the oil a minute to heat up, then add the mushroom slices in an even layer. Avoid overcrowding the skillet and cook the mushrooms in batches if needed.
  • Cook the mushrooms for about 4 minutes on each side, until the slices are lightly browned.
  • Remove the mushroom slices from the skillet. Raise the heat to high and add another dash of oil to the skillet if it seems dry.
  • Add the asparagus, bell pepper, and onion. Cook the veggies for about 4 minutes, flipping them occasionally, until they’re tender-crisp and darkened in spots.
  • Lower the heat and return the mushrooms to the skillet. Carefully pour the sauce over the veggies.
  • Continue cooking the veggies, flipping them frequently, until most of the liquid from the sauce has cooked off, 1 to 2 minutes.
  • Remove the skillet from heat.
  • Season the veggies with additional salt and pepper to taste, then sprinkle them with cilantro.
  • Stuff the veggies into warm tortillas and slather with guacamole, or sauce of choice. Serve.


Nutrition information does not include guacamole.


Serving: 1fajita | Calories: 182kcal | Carbohydrates: 24.8g | Protein: 4.1g | Fat: 8.1g | Saturated Fat: 1.2g | Sodium: 442mg | Potassium: 241mg | Fiber: 2.9g | Sugar: 3.3g | Calcium: 29mg | Iron: 2mg

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