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    The VGN Way » 30 Minutes or less

    Oven Roasted Sheet Pan Portobello Mushroom Fajitas (Vegan + Gluten-Free)

    Published: Apr 19, 2021 · Modified: Aug 14, 2022 by Nija Clark · This post may contain affiliate links · 2 Comments

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    Jump to Recipe Print Recipe

    A Healthy, Mouthwatering & Easy To Make Sheet Pan Portobello Mushroom Fajita Dinner. 7 Ingredients, A Few Spices & Toppings. Dinner Is Ready In Under 30 Minutes. 

    Oven Roasted Sheet Portobello Mushroom Fajitas (Vegan + Gluten-free)
    Easy To Make Oven Roasted Sheet Pan Portobello Mushroom Fajitas (Vegan + Gluten-Free)
    Jump to:
    • Are Mushrooms A Good Source Of Protein?
    • What Is A Serving Size Of Portobello Mushrooms?
    • What Are The Health Benefits Of Eating Portobello Mushrooms?
    • Are Portobello Mushroom A Good Meat Substitute?
    • Ingredients To Make Meatless Fajitas
    • How To Make Sheet Pan Mushroom Fajitas
    • How To Julienne A Bell Pepper
    • Can I Make This A Vegan Chili's Mushroom Jack Fajita
    • Storage
    • Looking For Other Vegan Gluten-Free Mexican Inspired Recipes? Try These Out:
    • 📖 Recipe
    • Pin This Recipe For Later!

    Are Mushrooms A Good Source Of Protein?

    Mushrooms are a ok source of protein. A cup of mushrooms has about 4g of protein. Mushrooms are not the highest source of vegetable protein. One of the highest, Lima beans has 11.6g of protein per serving as compared to broccoli at 3g per serving on the lower end.

    Adding black beans is a great protein boost for this recipe.

    What Is A Serving Size Of Portobello Mushrooms?

    We calculate 2 to 3 mushrooms for each individual servings depending on size of mushroom and hunger level.

    One cup (~3oz) of mushrooms is considered a typical serving size according to WebMd. Large portobello caps can range from approximately 2.5 oz to 6 oz.

    What Are The Health Benefits Of Eating Portobello Mushrooms?

    They are low in calories, high in potassium, a good source of copper, niacin (B3) and if grown under UV light good for vitamin D. Mushrooms are the only vegan, non-fortified dietary source of vitamin D.

    Are Portobello Mushroom A Good Meat Substitute?

    Yes, they make a great substitute because of the rich umami flavor they have and a texture that is similar to animal protein. Did you know technically mushrooms are not a vegetable; they belong to the fungi kingdom. Although they are not vegetables, mushrooms provide several important nutrients.

    Mushrooms make a great “meaty” substitute for beef. Roasting them along with the onions and peppers during the roasting process; transforms them into a super savory selection.

    Ingredients To Make Meatless Fajitas

    Ingredients for oven roasted sheet pan portobello mushroom fajitas
    Ingredients For Oven Roasted Sheet Pan Portobello Mushroom Fajitas (Vegan + Gluten-Free)
    • Portobello Mushrooms
    • A Red Onion
    • Red, Yellow and Orange Bell Peppers
    • Fajitas Seasoning Mix - which is a simple mix of chili, cumin, cayenne, smoked paprika, onion and garlic powders. We used store-bought but this is a simple homemade recipe.
    • Olive Oil
    • Limes
    • Avocado
    • 2 packages of Gluten-Free Corn Tortillas or Almond Tortillas

    Note: this recipe makes about 9 good size fajitas

    How To Make Sheet Pan Mushroom Fajitas

    Preheat oven to 400 degrees. Place pieces of parchment on two full size baking sheets.

    Prepare vegetables by slicing mushrooms, bell peppers and onions and placing on baking sheets.

    Prepare mushroom marinade by mixing olive oil, lime juice, fajitas seasoning pack and a few tablespoons of water.

    Fajitas seasoning mix for oven roasted sheet pan portobello mushroom fajitas
    Portobello Mushroom Fajitas Marinade

    Drizzle the marinade over the veggies. Use both hands to toss the vegetables until evenly coated mixture.

    Seasoned Sheet Pan Portobello Mushroom Fajitas
    Seasoned Sheet Pan Portobello Mushroom Fajitas (Vegan + Gluten-Free

    Spread vegetables out evenly, do not crowd pan (a crowded pan can lead to steamed veggies instead of nicely caramelized roasted veggies).

    Roast mixture for about 20 minutes or until the vegetables have a nice golden color.

    Serve with tortillas, sliced avocado, squeeze of fresh lime juice over top and a dollop of vegan sour cream.

    How To Julienne A Bell Pepper

    Simply remove the top and bottom of pepper

    Cut the pepper open. Run the blade along the inner edge of the pepper to remove seeds.

    Flatten pepper with finger and begin julienning it.

    Can I Make This A Vegan Chili's Mushroom Jack Fajita

    This can easily be transformed into a copycat Chili's Mushroom Jack dish that's vegan, vegetarian, gluten-free and allergen friendly. Add the following ingredients:

    • Faux Grilled Chicken - we love the Dang brand of grilled plant-based chicken and Recipes by Jenn directions on marinating the "chicken" if you want to take it one step further
    • Plant-Based Bacon - we love Hooray Foods
    • Cheese - Chili's uses a shredded Monteray Jack; Miyoko's has a Vegan Pepper Jack selection as well as Whole Food's 365 brand

    To serve assemble ingredients into 4 individual bowls. Top with cheese, bacon and dollop of vegan sour cream.

    Storage

    Store in an airtight container with lid for up to a ¾ days.

    Looking For Other Vegan Gluten-Free Mexican Inspired Recipes? Try These Out:

    • Vegan Cauliflower Tamale Pie
    • Pecan Taco Bowl
    • Vegan Gluten-free Tacos

    📖 Recipe

    Oven Roasted Sheet Pan Portobello Mushroom Fajitas (Vegan + Gluten-Free)

    Nija Clark
    A Healthy, Mouthwatering & Easy To Make Sheet Pan Mushroom Fajitas Dinner. 7 Ingredients, A Few Spices & Topping. Dinner Is Ready In Under 30 Minutes. 
    Print Recipe Pin Recipe
    Prep Time 10 mins
    Cook Time 20 mins
    Total Time 30 mins
    Course Dinner, Main Course
    Cuisine Mexican
    Servings 9 Fajitas
    Calories 133 kcal

    Equipment

    • 2 large baking sheet
    • Parchment Paper

    Ingredients
      

    Sheet Pan Portabello Mushroom Fajitas

    • 10-12 (~1 ½ pounds) large Portobello mushrooms - stems removed
    • 1 (~8/9 ounces) large Red Onion
    • 1 large Red Pepper
    • 1 large Green Pepper
    • 1 large Yellow Pepper
    • 2 medium Limes
    • 1 package - store bought gluten free vegan fajitas spice mix
    • 1 tablespoon Olive oil
    • 10 8-inch flour gluten-free tortillas
    • 1 Avocado

    Instructions
     

    • Preheat oven to 400 degrees. Place pieces of parchment on two full size baking sheets.
    • Prepare vegetables by slicing portobello mushrooms, bell peppers and onions and place on baking sheets.
    • Prepare mushroom marinade by mixing olive oil, lime, fajitas seasoning pack and a few tablespoon of water.
    • Drizzle the marinade over the veggies. Use both hands to toss the vegetables until evenly coated in oil and spices.
    • Spread vegetables out evenly, do not crowd pan (a crowded pan can lead to steamed veggies instead of nicely caramelized roasted veggies).
    • Bake mixture for about 20 minutes or until the vegetables edges have a nice brown color.
    • Serve with tortilla, sliced avocado, squeeze of fresh lime juice over top and a dollop of vegan sour cream.

    Notes

    Notes for Mushroom Jack version
    • Faux Grilled Chicken - we love the Dang brand of grilled plant-based chicken
    • Plant-Based Bacon - we love Hooray Foods
    • Cheese - Chili's uses a shredded Monteray Jack; Miyoko's has a Vegan Pepper Jack selection as well as Whole Food's 365 brand

    These nutritional figures should be considered estimates. Varying factors such as product types or brands purchased, natural fluctuations in fresh produce, and the way ingredients are processed change the effective nutritional information in any given recipe.

    Pin This Recipe For Later!

    If you give this vegan mushroom fajitas recipe a try, let us know! Leave a comment, or take a picture and tag and us on Instagram at #thevgnway

    And be sure to check out more of our quick and easy plant-based recipes on www.thevgnway.com

    Live Love and Eat Good Food!

    THE VGN WAY

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    Reader Interactions

    Comments

    1. KDK

      March 30, 2022 at 9:35 pm

      5 stars
      These were very easy to make and came out perfect. This is also a good meal prep for a quick and tasty lunch.

      Reply
      • Nija Clark | The Vgn Way

        April 01, 2022 at 5:37 pm

        So glad you enjoyed the mushroom fajitas. Thanks so much and couldn’t agree more about being great for meal prep.

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