Fajita-Stuffed Portobello Mushrooms

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These fajita-stuffed portobello mushrooms are the mash-up you’ve been waiting for! This flavorful vegetarian dish fills roasted portobello mushroom caps with fajita-style veggies and black beans, giving them a boost of fiber and protein. Top it off with melted cheese and Greek-style yogurt for a satisfying dinner.

Recipe Image of Fajita-Stuffed Portobello Mushrooms
Credit:

Photographer: Morgan Hunt Glaze, Prop Stylist: Claire Spollen, Food Stylist: Chelsea Zimmer

Active Time:
25 mins
Total Time:
55 mins
Servings:
4
  • Roasted bell peppers and onions bring classic fajita flavor to juicy mushroom caps.
  • Black beans in the filling offer fiber and plant-based protein for a healthy gut.
  • Roasting mushrooms stem-side down lets moisture drain to prevent sogginess.

These Fajita-Stuffed Portobello Mushrooms are the delicious plant-based dinner you didn’t know you needed—until now! They capture all the sizzling, smoky goodness of fajitas, but tucked into a juicy, roasted portobello mushroom cap. Roasted bell peppers and onions bring on the classic flavor, while black beans add fiber and plant-powered protein. And the best part? These easy stuffed mushrooms are made using only two sheet pans, so you can keep cleanup short and sweet. Read on for the tips and tricks to make these mushrooms happen at home.

Tips from the EatingWell Test Kitchen

These are the key tips we learned while developing and testing this recipe in our Test Kitchen to make sure it works, tastes great and is good for you too! 

  • Look for medium-size portobello caps that are shaped like a cup to hold the filling. If the mushrooms are flat, gently scoop out some of the flesh from the middle of the mushroom to hold the filling.
  • Be sure to roast your mushrooms stem-side down before you flip them and add the filling. This allows moisture to drain from the mushrooms and prevents them from becoming soggy.
  • We add smoked paprika to give the veggies that classic charred flavor. If you don’t have smoked paprika, chili powder can be used in its place.

Nutrition Notes

  • Mushrooms contain selenium, an antioxidant that is known for its anti-inflammatory properties. Reducing inflammation is important, as it can help reduce risk of chronic diseases including cardiovascular disease and cancer. Mushrooms also contain potassium, which is key for muscle health and can lower blood pressure.
  • Black beans provide plant-based protein in these stuffed mushrooms, but that’s not all they bring. The legumes also offer a type of fiber, resistant starch, which is known for supporting a healthy gut. Black beans are also great for heart health because they are free of saturated fat and high in fiber. 
  • Bell peppers are a good source of carotenoids, including zeaxanthin and lutein, which support healthy vision and protect your eye health. Bell peppers are also high in vitamin C for immune health.
Ingredients for preparing fajita stuffed portobello mushrooms arranged on a cutting board and bowls, including bell peppers and spices

Photographer: Morgan Hunt Glaze, Prop Stylist: Claire Spollen, Food Stylist: Chelsea Zimmer

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Ingredients

Original recipe (1X) yields 4 servings

  • ¼ cup extra-virgin olive oil

  • 2 teaspoons chili powder

  • teaspoons ground cumin

  • teaspoons smoked paprika

  • ¾ teaspoon granulated garlic

  • ¾ teaspoon onion powder

  • 8 medium (4-ounce) portobello mushroom caps, stems and gills removed

  • 1 large red bell pepper, sliced ¼-inch thick (about cups)

  • 1 small red onion, sliced ¼-inch thick (about 1 cup)

  • ¼ teaspoon salt

  • 1 (15-ounce) can no-salt-added black beans, rinsed

  • 1 cup shredded Monterey Jack cheese, divided

  • ½ cup whole-milk plain strained (Greek-style) yogurt or sour cream

  • 2 tablespoons chopped fresh cilantro

  • Lime wedges for serving (optional)

Directions

  1. Preheat oven to 425°F with racks in top third and lower third positions. Whisk ¼ cup oil, 2 teaspoons chili powder, 1½ teaspoons cumin, 1½ teaspoons paprika, ¾ teaspoon granulated garlic and ¾ teaspoon onion powder together in a medium bowl.

    A yellow bowl containing mixed seasonings and a whisk resting inside

    Photographer: Morgan Hunt Glaze, Prop Stylist: Claire Spollen, Food Stylist: Chelsea Zimmer

  2. Brush 8 mushroom caps evenly with 3 tablespoons of the oil mixture; arrange stemmed-side down on a large baking sheet. Add sliced bell pepper and onion to the bowl with the remaining 1 tablespoon oil mixture; toss to coat. Spread in an even layer on a separate large rimmed baking sheet. Roast the mushrooms on the lower rack and the onions and peppers on the top rack until tender, about 20 minutes. Flip the mushrooms and sprinkle with ¼ teaspoon salt.

    Preparation for stuffed mushrooms with sliced vegetables and seasoning sauce

    Photographer: Morgan Hunt Glaze, Prop Stylist: Claire Spollen, Food Stylist: Chelsea Zimmer

  3. Divide rinsed black beans evenly among the mushroom caps. Sprinkle ½ cup cheese over the beans. Divide the bell pepper mixture among the mushrooms. Top with the remaining ½ cup cheese. Bake on the lower rack until the cheese is melted, about 8 minutes. Top with ½ cup yogurt (or sour cream) and sprinkle with 2 tablespoons cilantro. Serve with lime wedges, if desired.

    Portobello mushrooms stuffed with beans, cheese, and red peppers displayed on a baking sheet

    Photographer: Morgan Hunt Glaze, Prop Stylist: Claire Spollen, Food Stylist: Chelsea Zimmer

Frequently Asked Questions

  • Why are my mushrooms soggy?

    Mushrooms release water when they’re cooked. It’s important to pre-cook them well before stuffing them. If your mushrooms are still firm to the touch after 20 minutes in the oven, they may need to roast a little bit longer before you fill them. Once you flip them, you can also remove any water from the center with a paper towel before you fill them.

  • What else can I stuff them with?

    You can stuff them with anything! Cooked ground turkey, lean ground beef or cooked crumbled tofu will all add extra protein. Roasted corn, zucchini or a poblano pepper would be great veggies to swap in. Just be sure to cook the veggies before you use them for stuffing.

  • Do I have to remove the gills?

    Yes. The gills can trap dirt and moisture in the portobello caps. They are easily removed by scraping them out with a spoon.

EatingWell.com, May 2025

Nutrition Facts (per serving)

427 Calories
25g Fat
33g Carbs
23g Protein
Nutrition Facts
Servings Per Recipe 4
Serving Size 2 stuffed mushrooms
Calories 427
% Daily Value *
Total Carbohydrate 33g 12%
Dietary Fiber 10g 37%
Total Sugars 8g
Added Sugars 0g 0%
Protein 23g 45%
Total Fat 25g 32%
Saturated Fat 8g 41%
Cholesterol 29mg 10%
Vitamin A 164µg
Vitamin C 57mg 63%
Vitamin D 1µg
Vitamin E 4mg 28%
Folate 128µg
Vitamin K 17µg
Sodium 366mg 16%
Calcium 311mg 24%
Iron 5mg 26%
Magnesium 80mg 19%
Potassium 1139mg 24%
Zinc 3mg 25%
Vitamin B12 1µg
Omega 3 0g

Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate.

* Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.)

(-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.

Additional reporting by
Hilary Meyer
Hilary Meyer
Hilary Meyer is a recipe developer, tester, and content creator. After graduating from culinary school, she started working the EatingWell Test Kitchen in 2006, developing and testing recipes.
and
Alex Loh
Square Headshot of Alex Loh
Alex Loh is EatingWell's food editor. As part of the food team, she creates healthy, delicious recipes for the EatingWell audience. Alex also writes informative food and cooking articles that range from how to store ground beef to the best picks from Trader Joe's. Alex conducts product and taste tests to find the best options, from salad spinners to salsas.