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5.0 from 231 votes

The Best Grilled Portobello Mushroom Burger

I set out to make a great tasting grilled portobello mushroom burger that even a meat lover would love. The mushrooms are marinated then grilled and topped with melted Swiss Cheese, grilled red onion, tomatoes, spinach, and avocado – yum!!

Prep Time
30 mins
Cook Time
30 mins
Total Time
1 hr
Servings: 4 servings
Calories: 295 kcal
Course: Lunch
Cuisine: American

Ingredients

  • 4 portobello mushroom caps
  • 2 tbsp balsamic vinegar
  • 1 tbsp low sodium soy sauce
  • 1 tablespoons olive oil
  • 1 tbsp chopped Rosemary
  • 1-1/2 tsp steak seasoning like Montreal Steak Grill Mates
  • 4 thick slices red onion
  • 4 oz reduced fat Swiss (sliced thin )
  • 4 thin slices tomato
  • 1/2 avocado (sliced thin)
  • baby spinach
  • 4 whole wheat low calorie buns (I used Martin)

Instructions

    Cup of Yum
  1. In a large bowl, whisk together vinegar, soy sauce, oil, rosemary, and Montreal steak seasoning.
  2. Place the mushroom caps in the bowl and toss with sauce, using a spoon to evenly coat. Let stand at room temperature for 20 to 30 minutes, turning a few times.
  3. Heat the grill or indoor grill pan over medium heat. When hot, brush the grate with oil or lightly spray the grill pan.
  4. Place the mushrooms on the grill, reserving marinade for basting. Grill for 5 to 7 minutes on each side, or until tender, brushing with marinade frequently.
  5. Top the mushrooms with cheese during the last minute of cooking.
  6. While the mushrooms cook, grill the onions about 1 minute on each side and grill the buns until toasted.
  7. To finish, place the spinach and grilled portobello mushrooms on the buns and top with the grilled onions, sliced tomato and avocado.

Nutrition Information

Serving 1loaded burger Calories 295kcal (15%) Carbohydrates 31g (10%) Protein 21g (42%) Fat 13g (20%) Saturated Fat 1g (5%) Sodium 594mg (25%) Fiber 11g (44%) Sugar 6g (12%)

Nutrition Facts

Serving: 4servings

Amount Per Serving

Calories 295

% Daily Value*

Serving 1loaded burger
Calories 295kcal 15%
Carbohydrates 31g 10%
Protein 21g 42%
Fat 13g 20%
Saturated Fat 1g 5%
Sodium 594mg 25%
Fiber 11g 44%
Sugar 6g 12%

* Percent Daily Values are based on a 2,000 calorie diet.