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Grilled Portabella Burger Recipe

American · Main course · 25 min total

A hearty and flavorful vegetarian burger featuring marinated portabella mushrooms grilled to perfection, topped with melted cheese and fresh fixings.

Ingredients

• 4 large portabella mushroom caps, stems removed
• 1/4 cup balsamic vinegar
• 2 tablespoons olive oil
• 2 cloves garlic, minced
• 1 teaspoon dried thyme
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 4 slices provolone or Swiss cheese
• 4 hamburger buns, split and toasted
• 1 cup fresh spinach leaves
• 1 large tomato, sliced
• 1/2 red onion, thinly sliced
• 4 tablespoons mayonnaise or aioli

Instructions

1. In a small bowl, whisk together balsamic vinegar, olive oil, minced garlic, thyme, salt, and pepper.
2. Place mushroom caps in a shallow dish and pour marinade over them. Let marinate for at least 15 minutes, turning once.
3. Preheat grill to medium-high heat (about 400°F).
4. Grill mushrooms for 4-5 minutes per side, until tender and grill marks appear. During the last minute, top each mushroom with a slice of cheese and cover grill to melt.
5. Spread mayonnaise on toasted bun halves. Place a cheese-topped mushroom on each bottom bun, then layer with spinach, tomato slices, and red onion. Close burgers and serve immediately.

Tips

• For extra flavor, add a dollop of pesto or roasted red pepper spread.
• If using a grill pan, cook over medium-high heat for same times.
• Leftover mushrooms can be sliced and used in salads or sandwiches.

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