This recipe is a great way to showcase colorful bell peppers, and mushrooms are a meaty vegetarian substitute for the skirt steak used in traditional Tex-Mex fajitas. Because there is no meat to be grilled, this recipe is easy to throw into the oven for a quick weeknight meal.


Prep Time35 mins
Cook Time22 mins
Total Time1 hr
Servings: 4 people



  • 1/4 cup olive oil
  • 1/4 cup orange juice
  • 2 tablespoons lime juice
  • 3 garlic cloves minced
  • 2 teaspoons cumin
  • 1 teaspoon dried oregano
  • 1 teaspoon paprika


  • 1 pound king oyster portobello, or shiitake mushrooms, or mixture of all three
  • 1 red onion sliced in thin strips
  • 3 red orange, or yellow bell peppers, sliced in strips
  • 1 tablespoon olive oil
  • 1/4 teaspoon salt
  • Small flour tortillas guacamole or avocado, salsa, lime wedges, and cilantro for serving


  • Preheat oven to 450 F and move one rack to the top slot in the oven.
  • In a large bowl, whisk together all the marinade ingredients.
  • Toss the mushrooms in the marinade until evenly coated. Let sit for 30 minutes. Toss peppers and onions with 1 tablespoon of olive oil and 1/4 teaspoon of salt.
  • Spread marinated mushrooms, onions, and peppers across an oiled baking sheet with a rim and bake for 20 minutes.
  • Move pan to top rack and broil for 2 additional minutes to add some char to the veggies.
  • Serve with warm tortillas, salsa, guacamole or avocado, and fresh cilantro.

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