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Close-up of stuffed portobello mushroom burger on golden toasted bun, topped with melted cheese, crispy bacon, caramelized onions, and fresh chopped parsley, with two more burgers in soft focus background on white plate

Stuffed Portobello Mushroom Burgers

Juicy, roasted Portobello caps stuffed with a savory mixture of beef, caramelized onions, and melted Swiss cheese. A hearty and flavorful alternative to the traditional burger.
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Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings: 4
Course: Dinner
Cuisine: American
Calories: 410
Ingredients Equipment Method Notes

Ingredients
  

  • 4 large Portobello mushroom caps Gills removed
  • 1 pound Ground beef Optional meat filling
  • ½ cup Swiss cheese Shredded
  • ¼ cup Caramelized onions Finely chopped
  • 2 cloves Garlic Minced
  • 2 tablespoon Fresh parsley Chopped
  • 1 tablespoon Olive oil For brushing
  • 4 Brioche buns Toasted

Equipment

  • 1 Baking Sheet Large non-stick
  • 1 Skillet For browning beef
  • 1 Spoon For removing gills

Method
 

  1. Wipe the mushroom caps clean and remove the dark gills using a small spoon.
  2. Brush the caps with olive oil and minced garlic on both sides for flavor.
  3. Roast the caps at 400°F for ten minutes until they begin to soften properly.
  4. Brown the ground beef and caramelized onions in a skillet until fully cooked through.
  5. Drain any excess liquid from the roasted mushroom caps to ensure a firm base.
  6. Fill each cap with the beef mixture and top with shredded Swiss cheese.
  7. Return to the oven for five minutes until the cheese is melted and bubbly.
  8. Place the stuffed caps onto toasted buns and serve with your favorite toppings.

Notes

Wipe mushrooms with a damp cloth instead of washing to prevent sogginess. Remove the gills carefully to create more space for the savory filling.