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Portobello Veggie Burgers

These meaty portobello mushroom burgers are a great vegetarian option for anyone looking to switch up their burger game. With black beans, walnuts, and flax seeds, they're full of flavor and nutrition.

Tasty Team
85% would make again


for 5 servings

  • 15 oz black beans (400 g), 1 can, drained and rinsed
  • ½ teaspoon salt
  • 1 clove garlic, minced
  • 2 large portobello mushroom caps, finely chopped
  • ½ cup walnuts (50 g), finely chopped
  • ¼ cup parsley (10 g), finely chopped
  • 2 tablespoons ground flaxseed
  • 4 tablespoons water

Nutrition Info

  • Calories 181
  • Fat 9g
  • Carbs 18g
  • Fiber 8g
  • Sugar 0g
  • Protein 8g

Estimated values based on one serving size.


  1. Preheat oven to 375˚F (190˚C).
  2. In a large bowl, microwave black beans for 1 minute, or until softened.
  3. Add salt and garlic. Mash until black beans are finely mashed.
  4. Add mushrooms, walnuts, and parsley.
  5. In a small bowl, mix ground flax and water and stir until thoroughly combined.
  6. Add flax mixture to the mushroom mixture and mix thoroughly.
  7. Using a ½ cup (120 ml) measuring cup, portion 5 patties from the mixture. Place onto a lightly greased parchment-lined sheet pan.
  8. Bake for 30 minutes, or until firm and browned, flipping over halfway through.
  9. Serve burgers with your favorite fixins.
  10. Enjoy!
  11. Don't just wing it -- plan it! Use our meal planner tool in the Tasty app. Download here.