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These delicious Philly Cheese Steak Stuffed Mushrooms will be a hit with the entire family! Low carb and gluten free too!

Low Carb Philly Cheese Steak Stuffed Mushrooms

  • Author: Mellissa Sevigny
  • Yield: 4 servings 1x
  • Category: Entree or Appetizer
  • Cuisine: American


The whole family will love this super easy recipe that is loaded with beef, onion, and cheese! Gluten free, low carb, and keto friendly!



  • 4 large portobello mushroom caps – or 16 smaller caps for appetizer sized
  • 2 cups chopped deli roast beef (about 1lb)
  • 1 cup onion, sliced
  • 3 Tbsp butter
  • 1/4 tsp garlic powder
  • 1 tsp kosher salt
  • 1/4 tsp black pepper
  • 1/4 cup mayonnaise
  • 2 tsp dijon mustard
  • 4 slices provolone cheese


  1. Combine the sliced onions, butter, garlic powder, salt, and pepper in a medium saute pan. Cook over medium heat until the onions are soft and starting to brown.
  2. Meanwhile, place the mushroom caps upside down on a paper towel-lined plate and microwave on high for 3 minutes. Turn mushrooms over and microwave for another 2 minutes.
  3. Add the beef to the onions and cook for 2 minutes.
  4. Remove from the heat and stir in the mayonnaise and mustard – stir well.
  5. Taste and season with additional salt and pepper as desired.
  6. Stuff the mushroom caps generously with the beef mixture (about 1/2 cup per cap if making four large ones), then top with a slice of cheese.
  7. Broil for 2-3 minutes, or until the cheese is browned and bubbling. Serve hot.
  8. Alternatively you could bake for 15 minutes at 375 degrees (F) or grill them over indirect heat with the cover down for about 6 – 8 minutes.


Approx nutrition info per serving: 422 calories, 31g fat, 5g net carbs, 29g protein

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