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–+ servings

Healthy Portobello Mushroom Sheet Pan Fajitas Recipe

These vegetarian sheet pan fajitas are a healthy and flavorful way to enjoy a quick meal.
Featuring hearty portobello mushrooms, bell peppers, and onions, this recipe is perfectly seasoned with classic fajita spices and roasted to perfection.
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Prep Time 10 minutes
Cook Time 25 minutes
Course Main Course
Cuisine Mexican-Inspired
Servings 6
Calories 544 kcal

Equipment

  • 2 Rimmed baking sheets

Ingredients
  

For the Seasoning:

  • 1/2 tablespoon chili powder
  • 1/2 tablespoon ground cumin
  • 1 teaspoon garlic powder
  • 1/2 teaspoon sweet paprika
  • 1/2 teaspoon oregano
  • 1/2 teaspoon kosher salt
  • 1/4 teaspoon freshly ground black pepper

For the Filling:

  • 4 portobello mushroom caps sliced about 1/2 inch thick
  • 1 medium yellow onion halved and thinly sliced
  • 2 medium bell peppers any color, seeded and thinly sliced
  • 2 tablespoons avocado oil or extra-virgin olive oil
  • 6 gluten-free or cassava flour tortillas warmed
  • 1 medium avocado peeled, pitted, and thinly sliced, for garnish
  • 2 limes cut into wedges, for serving
  • Roughly chopped cilantro for garnish
  • 1/2 cup crumbled queso fresco for garnish

Instructions
 

  • Preheat the Oven: Set your oven to 450°F.
  • Prepare the Seasoning: In a small bowl, mix the chili powder, cumin, garlic powder, paprika, oregano, salt, and pepper.
  • Assemble the Filling: Spread the sliced mushrooms on one baking sheet. On another sheet, arrange the sliced onions and bell peppers. Drizzle both with avocado or olive oil, then sprinkle the seasoning evenly over the vegetables. Toss to coat well. Roast for 20–25 minutes, stirring halfway through, until the vegetables are tender and slightly charred.
  • Build the Fajitas: Fill the warmed tortillas with a portion of roasted mushrooms, onions, and peppers. Top with avocado slices, cilantro, queso fresco, and a squeeze of lime juice.

Notes

Storage: Store the roasted vegetables in airtight containers in the refrigerator for up to 4–5 days. Keep tortillas and garnishes separate.
Reheating: Warm the vegetables in a skillet or in a 350°F oven for 5–10 minutes.
Serving Tip: Pair with a side of rice or beans for a more filling meal.

Nutrition

Serving: 2fajitasCalories: 544kcalCarbohydrates: 65gProtein: 12gFat: 30gSaturated Fat: 6gCholesterol: 13mgSodium: 595mgFiber: 12gSugar: 5g
Keyword Easy dinner ideas, Gluten-free fajitas, Healthy fajitas recipe, healthy food recipes, Sheet pan dinner recipes, Vegetarian fajitas
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