Description

This Easy Vegetarian Fajitas recipe features flavorful roasted portobello mushrooms, bell peppers, and onions seasoned with fajita spices, served alongside seasoned black beans. Perfect for a quick, healthy, and colorful sheet pan dinner, you can customize with your favorite toppings like avocado, cheese, sour cream, and salsa.

Ingredients

Scale

Vegetables

2 large portobello mushroom caps, cleaned and sliced into strips
3 large bell peppers (red, yellow, and green), sliced into strips
1 medium red onion, peeled and sliced thin (about 1 cup)

Seasonings and Oil

2 tablespoons avocado oil
3 tablespoons fajita seasoning (for vegetables)
1 tablespoon fajita seasoning (for black beans)

Beans

1 (15 ounce) can black beans, drained and rinsed
2 tablespoons vegetable stock

Toppings (optional)

Avocados, sliced or mashed with lime and salt
Chopped fresh cilantro
Limes, cut into wedges
Cojita cheese or shredded cheddar cheese
Sour cream
Salsa

Instructions

Season and prepare the vegetables: In a large bowl, combine the sliced portobello mushrooms, bell peppers, and red onion. Drizzle with avocado oil and sprinkle with 3 tablespoons of fajita seasoning. Toss thoroughly so all the vegetables are evenly coated. Let the mixture sit for 10 minutes to marinate.
Preheat oven and prepare baking sheet: Preheat your oven to 400 degrees Fahrenheit (200 degrees Celsius). Line a baking sheet with parchment paper for easy cleanup.
Roast the vegetables: Spread the seasoned vegetables in a single even layer on the prepared baking sheet. Bake them in the preheated oven for 10-12 minutes, keeping an eye on them if the slices are thin to prevent burning. The vegetables should be tender and slightly caramelized when done.
Cook the black beans: While the vegetables bake, warm a skillet over medium heat. Add the drained black beans along with 2 tablespoons of vegetable stock and 1 tablespoon of fajita seasoning. Stir and cook for 2-3 minutes, then reduce the heat to low and let simmer for 1-2 additional minutes until warmed through.
Assemble the fajitas: Remove the roasted vegetables from the oven. Serve them alongside the seasoned black beans. Add your preferred fajita toppings such as avocado slices or mashed avocado seasoned with lime and salt, chopped cilantro, lime wedges, cheese, sour cream, and salsa.
Serving suggestion: These fajitas can be enjoyed as a fajita bowl or served with warm corn or flour tortillas to create traditional fajitas.

Notes

Adjust the fajita seasoning quantity to suit your spice preference or use homemade seasoning.
Veggies can be sliced thinner for quicker roasting but watch closely to avoid burning.
For vegan version, omit cheese and sour cream or substitute with plant-based alternatives.
Leftover roasted vegetables make a great addition to salads or grain bowls.
You can prepare the fajita seasoning ahead of time to save prep time.

Prep Time: 15 minutes
Cook Time: 15 minutes
Category: Main Course
Method: Baking
Cuisine: Mexican

Keywords: vegetarian fajitas, sheet pan fajitas, easy fajitas, roasted vegetable fajitas, black bean fajitas, quick vegetarian dinner