clock clock iconcutlery cutlery iconflag flag iconfolder folder iconinstagram instagram iconpinterest pinterest iconfacebook facebook iconprint print iconsquares squares iconheart heart iconheart solid heart solid icon

Portabella Burger

  • Author: Mushrooms Canada
  • Prep Time: 10 minutes
  • Cook Time: 25 minutes
  • Total Time: 35 minutes
  • Yield: 4 1x


A juicy portabella burger topped with provolone cheese, sautéed balsamic-glazed red onion, and a delicious red pepper pesto mayo.


  • 3 tbsp oil, divided
  • 1 medium red onion, thinly sliced
  • 1 tsp balsamic vinegar
  • 2 tbsp mayonnaise
  • 1 tbsp red pepper pesto
  • 4 large portabella mushrooms, stems removed
  • 4 slices provolone cheese
  • 4 burger buns
  • Optional Toppings: Fresh arugula or baby spinach


  1. Heat 1½ tbsp oil in a large nonstick skillet over medium-high heat. Add sliced onions; cook, stirring occasionally, until onions are softened and translucent, about 7 minutes. Add balsamic vinegar; cook, stirring for 1 minute. Remove from heat and set aside.
  2. In a small bowl, whisk together mayonnaise and pesto; set aside.
  3. Place portabella mushrooms on a plate, brush tops and gills with remaining oil. Transfer to pre-heated grill, gill side down; cook 5-6 minutes. Flip and cook another 5-6 minutes.
  4. Top each portabella slice with cheese; allow cheese to melt, about 1-2 minutes. Remove from heat.
  5. To assemble, spread the bottom of each bun with pesto mayo. Top with grilled portabella, sautéed onions, and fresh arugula.


  • Skip the grill. The portabella mushrooms can also be baked in the oven. Place the mushrooms gill side up on a baking tray and cook in a 425°F oven for 15-20 minutes.
  • Mix up the cheese! Try sliced cheddar, pepperjack, or Swiss. Crumbled cheeses like goat or blue cheese also work well.
  • Toasting the buns adds a nice crispness to this burger.


  • Calories: 424
  • Sugar: 8.3g
  • Fat: 25.8g
  • Saturated Fat: 7g
  • Carbohydrates: 34.5g
  • Fiber: 2.9g
  • Protein: 14.7g
  • Cholesterol: 22.5mg

Keywords: Ready in 35, Handheld Favourite, Vegetarian, Portabella Mushrooms

Try These!