Portobello mushroom Fajitas

Quick & Easy

Delicious, aromatic, meatless fajitas ready in 30 minutes!

Traditionally, a fajita is a simple meat and vegetable dish, usually served in a sizzling cast iron pan along with warmed flour or corn tortillas and toppings such as guacamole, cheese, salsa and sour cream. I used to love the original version of it and now, I love the vegan one, too!
Today’s portobello mushroom fajitas recipe is very easy to prepare and ready in under 30 minutes!
All you need to do is to cut and season the vegetables and prepare the side dishes – the oven will do the rest. With colorful peppers, sweet onions, and meaty slices of portobello mushrooms, these fajitas are a very tasty lunch or dinner idea.

meat free fajitas

What are the best toppings for Fajitas?
  • sliced avocado
  • salsa
  • vegetable sour cream
  • grated cheese
  • lettuce leaves
  • sliced jalapenos
  • fresh coriander
  • guacamole
  • The versatile Portobello.

    Mushrooms are an excellent substitute for meat in various types of dishes. Surely you have seen vegan mushroom kebabs, shawarma, steaks or stews recipes more than once. Portobello mushrooms are a fantastic and meat-like, plant-based substitute for chicken or beef, also in this simple but aromatic dish.
    What does portobello taste like?
    Portobello mushrooms have a wonderfully earthy flavor, often described as meat. They taste similar to chestnut mushrooms, but with a richer and more intense umami flavor.
    You can eat portobello raw, but cooking gives them a more intense taste.

    portobello mushroom fajitas

    Homemade Fajitas Seasoning.

    What does Fajita spice contain? Most fajita spice mixes consist of a few simple Mexican spices like cumin and chili powder, as well as a few extra spices like paprika, garlic powder, onion powder, and cayenne pepper.
    What can you use instead of the store bought fajita spice?
    You do not have to look for a ready-made mixture in stores. Make your own homemade fajita spice! It is extremely simple, ready in a few minutes and without any preservatives!
    ½ tablespoons ground chili or cayenne pepper
    2 tablespoons of sweet, smoked paprika
    1 tablespoon of ground cumin
    1 tablespoon of garlic powder
    1 tablespoon of onion powder
    ½ tablespoon of ground coriander
    1 heaped tablespoon of dried oregano
    ½ teaspoon of salt, optional
    Put chili powder, cumin, smoked paprika, garlic powder, onion powder, coriander, oregano and, optionally, salt into a small jar. Twist and shake vigorously to mix the ingredients together. Ready!
    Store in a closed jar or airtight container for several months.

    vegan fajitas

    Portobello mushroom Fajitas

    Servings 4 servings
    Prep Time 10 mins
    Cook Time 20 mins
    Total Time 30 mins


    • oven
    • baking tray


    • 2 portobello mushrooms sliced
    • 3 peppers sliced
    • 2 onions sliced
    • 2 cloves garlic sliced
    • 2 tbsp olive oil
    • 2 tbsp fajita spice mix see recipe above
    • 1 tsp wine vinegar
    • salt optional, to taste
    • favorite fajita toppings


    • Preheat the oven to 375F [ 200ºC ].
    • Cut the onion into thick slices, slice the garlic, and cut the portobello and peppers into strips.
    • Mix the oil with vinegar and fajita spice, then pour into a bowl with vegetables and mix thoroughly - the easiest way to do it with your hands.
    • Spread the prepared vegetables in an even layer on the baking tray and
      place in the oven for 20 minutes.
    • In the meantime, prepare the topping for the fajitas - heat the tortillas [ just put them on a dry frying pan for a while ], prepare the tomato salsa, guacamole, slice the lime, chop the coriander ...
    • Take the fajitas out of the oven, put them on a serving plate and serve immediately.


    Nutritional value - ¼ fajitas without toppings
    118 kcal | Carbohydrates 13 g | Protein 5 g | Fat 5.7 g | Fiber 1.8 g
    Course: Main Course
    Cuisine: Mexican
    Keyword: budget friendly, fajita spice mix, gluten free option, low in calories, onion, peppers, portobello, portobello mushrooms

    Other ways to prepare Fajitas.

    Instead of in the oven, you can also prepare fajitas on the grill or in a pan.
    Grilled fajitas: Prepare the vegetables according to the directions above. Then spread out in an even layer on the aluminum tray. Put the tray on the hot grill and wait until the vegetables and mushrooms are soft and browned – you can turn them over from time to time.
    Stir-fried fajitas: cut vegetables and mushrooms according to the instructions in the recipe and season with dry fajita spice. In a frying pan, heat the olive oil, add the vegetables and fry, stirring occasionally, until they are soft and caramelized.

    Did you make this recipe?

    Please let me know how it turned out for you! Leave a comment below and tag @vitobites on Instagram and hashtag it #vitobites.
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    Cooked with by Magdalena Wrona.
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