Sheet Pan Portobello Mushroom Fajita Bowl

Last Updated on July 14, 2025 by Christin Gillespie

Hearty & healthy, this Sheet Pan Portobello Mushroom Fajita Bowl is a flavorful vegan recipe. It’s a Mexican creation that includes meaty mushrooms, vibrant bell peppers, mild onions, cilantro-lime cauliflower rice, warm black beans, & creamy avocado. Enjoy it on a busy weeknight or save it for meal prep!

If you’re looking to switch up your fajita evening, then look no further than this portobello mushroom recipe!

The inspiration for this recipe comes from the traditional steak fajitas, but with a plant-based, soy-free, & healthy twist. While portobello steaks don’t taste exactly like a steak, they embody a “meaty” texture & they’re super tasty in their own right.

Alongside the fajitas, the pairings of cilantro-lime cauliflower rice, black beans, & creamy avocado result in a yummy fiesta dinner!

Why You’ll Love This Sheet Pan Fajita Bowl Recipe

• Flavor-Packed: Although this fajita bowl is on the healthier side, it still embodies that authentic Mexican flavor that we all love.
• Completely Customizable: With this creation, you have the flexibility to incorporate your favorites.
• Perfect for Meal Prep: This Sheet Pan Portobello Mushroom Fajita Bowl stores well in the fridge, making it a great recipe to meal prep for healthy dinners throughout the week.

Ingredients

• Organic Portobello Mushrooms: The star of this sheet pan fajita dinner. If you’re unfamiliar with them, they’re essentially the largest mushrooms!
• Organic Bell Peppers & Onions: For the fajitas, of course! You can use any color combination that you have on hand!
• Organic Black Beans: The beans are the staple for this fajita bowl. They’re also full of healthy fats & plant-based protein. 
• Organic Cauliflower Rice: Cauliflower rice isn’t technically rice, but it looks like it while being packed with nutrition. You can find organic pre-made cauliflower rice at your local health food store. 
• Organic Avocado: Slice it, dice it, or mash it up into guacamole for some healthy fats.
• Organic Lime: A healthy squeeze of lime elevates the cauliflower rice.
• Organic Fresh Cilantro: For the cauliflower rice & for topping.
• Organic Spices: Chili powder, ground cumin, smoked paprika, dried oregano, garlic powder, sea salt & black pepper. 
• Organic Avocado Oil: Avocado oil is my go-to baking oil because it’s neutral in flavor & it can be used to cook at high-heat temperatures. 

How to Make 

1. Sheet Pan. Preheat the oven to 425 degrees F & line a sheet pan with parchment paper. Toss the fajitas with the oil & seasonings. Transfer to the oven & roast for 20–25 minutes, flipping halfway. 
2. Cilantro-Lime Cauliflower Rice. In a skillet, defrost the cauliflower rice. Once defrosted, stir in the remaining ingredients.
3. Assemble. Divide the cilantro-lime rice, warm black beans, & fajitas between bowls. Top with avocado & fresh cilantro. Enjoy!

Tips for Making this Sheet Pan Fajita Bowl Perfectly

• Organic Black Beans: Organic pinto beans will also work.
• Organic Onions & Bell Peppers: Feel free to use whatever color of onion & bell peppers you prefer.
• Organic Herbs: Be sure to use fresh cilantro for optimal flavor.

Storing & Reheating

This Sheet Pan Portobello Mushroom Fajita Bowl is the perfect vegan recipe for healthy leftovers & meal prep!

Storage. Transfer ingredients to separate airtight glass containers & refrigerate for up to 4 days.

Reheating. To reheat, preheat the oven to 350 degrees F. Transfer the fajitas, beans, & cilantro-lime cauliflower rice to an oven-safe bowl. Place in the oven for about 10–15 minutes, until warmed through. To serve, pair with the remaining bowl ingredients.

More Fajita Bowl Recipes You’ll Love

• Portobello Steak & Quinoa Fajita Bowl
• Enchilada Cauliflower & Black Bean Fajita Bowl with Jalapeño Crema
• Chili-Lime Crispy Chickpea Fajita Bowl with Cashew Sour Cream
• Roasted Sweet Potato & Quinoa Fajita Bowl with Cashew Queso
• Sheet Pan Jackfruit Enchilada Fajita Bowl

Sharing Is Caring!

If you make this Sheet Pan Portobello Mushroom Fajita Bowl recipe, please leave a review & rating below. I love hearing from you & it helps others learn more about the blog as well. Be sure to follow along on Pinterest, Instagram, & TikTok for even more healthy content!

Xoxo.

CMG.

Print