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The Best Grilled Portobello Mushroom Burger

The Best Grilled Portobello Mushroom Burger

Indulge in The Best Grilled Portobello Mushroom Burger, a hearty yet healthy alternative that even meat lovers will crave. This delicious burger features marinated portobello mushroom caps grilled to perfection and topped with melted Swiss cheese, grilled red onions, fresh tomatoes, baby spinach, and creamy avocado. Perfect for summer barbecues or casual dinners, this recipe highlights the rich umami flavors of the mushrooms while remaining low in calories and high in protein. Whether you’re hosting friends or enjoying a weeknight meal, this burger is sure to impress with its satisfying textures and customizable toppings.

  • Total Time: 45 minutes
  • Yield: Serves 4

Ingredients

Scale
  • 4 portobello mushroom caps
  • 2 tbsp balsamic vinegar
  • 1 tbsp low sodium soy sauce
  • 1 tbsp olive oil
  • 1 tbsp chopped rosemary
  • 1.5 tsp Montreal steak seasoning
  • 4 thick slices red onion
  • 4 oz reduced fat Swiss cheese (sliced thin)
  • 4 thin slices tomato
  • 1/2 avocado (sliced thin)
  • baby spinach
  • 4 whole wheat low-calorie buns

Instructions

  1. In a large mixing bowl, whisk together balsamic vinegar, soy sauce, olive oil, rosemary, and steak seasoning.
  2. Add the portobello caps to the marinade and coat evenly; let sit for 20-30 minutes.
  3. Preheat your grill over medium heat and brush with oil.
  4. Grill the marinated mushrooms for about 5-7 minutes on each side, basting frequently.
  5. During the last minute of cooking, place Swiss cheese on top of the mushrooms to melt.
  6. Grill red onion slices for about one minute per side until charred.
  7. Assemble burgers by layering spinach on buns followed by grilled mushrooms, onions, tomatoes, and avocado.
  • Author: Juniper
  • Prep Time: 30 minutes
  • Cook Time: 15 minutes
  • Category: Main
  • Method: Grilling
  • Cuisine: American

Nutrition

  • Serving Size: 1 burger (approximately 250g)
  • Calories: 350
  • Sugar: 4g
  • Sodium: 550mg
  • Fat: 15g
  • Saturated Fat: 5g
  • Unsaturated Fat: 9g
  • Trans Fat: 0g
  • Carbohydrates: 39g
  • Fiber: 10g
  • Protein: 20g
  • Cholesterol: 15mg

Keywords: For an added flavor kick, try different marinades or sauces like pesto or aioli. Experiment with various cheese types to find your favorite combination. Use fresh vegetables for enhanced flavor and nutritional value.