The Best Grilled Portobello Mushroom Burgers

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!!

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!!

The only thing my husband said would make these burgers better is adding bacon… maybe next time.  I wanted to give the mushrooms a meaty flavor, so I marinated them with balsamic, soy sauce and Montreal steak seasoning. These were so good, perfect for meatless Mondays or any night of the week.

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!!
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The Best Grilled Portobello Mushroom Burgers

6
Freestyle Points
295
Calories
Prep Time: 30 mins
Cook Time: 30 mins
Total Time: 1 hr
Yield: 4 servings
CUISINE: American
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!!

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 (Alpine lace)
  • 4 thin slices tomato
  • 1/2 avocado, sliced thin
  • baby spinach
  • 4 whole wheat low calorie buns, I used Martin

Instructions

  • In a large bowl, whisk together vinegar, soy sauce, oil, rosemary, and Montreal steak seasoning.
  • 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.
  • Heat the grill or indoor grill pan over medium heat. When hot, brush the grate with oil or lightly spray the grill pan.
  • 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.
  • Top the mushrooms with cheese during the last minute of cooking.
  • While the mushrooms cook, grill the onions about 1 minute on each side and grill the buns until toasted.
  • To finish, place the spinach and grilled portobello mushrooms on the buns and top with the grilled onions, sliced tomato and avocado.

Nutrition

Serving: 1loaded burger, Calories: 295kcal, Carbohydrates: 31g, Protein: 21g, Fat: 13g, Polyunsaturated Fat: 0g, Monounsaturated Fat: 0g, Trans Fat: 0g, Cholesterol: 0mg, Sodium: 594mg, Potassium: 0mg, Fiber: 11g, Sugar: 6g, Vitamin A: 0%, Vitamin C: 0%, Calcium: 0%, Iron: 0%
Freestyle Points: 6
Points +: 8