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The Best French Onion Stuffed Mushrooms Recipe

Stuffed mushrooms may not seem like the most exciting party appetizer. But cheesy French onion stuffed mushrooms are an entirely different story.


  • 2 tbsp. butter
  • 1 tbsp. extra-virgin olive oil
  • 2 large yellow onions, halved and thinly sliced
  • Kosher salt
  • Freshly ground black pepper
  • 2 tsp. fresh thyme leaves
  • 2 cloves garlic, minced
  • 1/4 c. dry sherry
  • 1 lb. baby bella mushrooms, stems removed
  • 1 c. shredded Gruyère
  • 2 tsp. freshly chopped parsley

Preheat oven to 450°. Line a rimmed baking sheet with parchment paper.
In a large skillet over medium heat, heat butter and oil. Add onions and season with salt, pepper, and thyme. Reduce heat to medium-low and cook, stirring occasionally, until onions are caramelized and jammy, about 20 minutes.

Increase heat to medium-high, stir in garlic and cook, stirring, until fragrant, about 30 seconds. Stir in sherry and simmer until almost completely reduced, 2 minutes. Remove from heat.

Place mushrooms stem-side up on the prepared baking sheet. Roast mushrooms on top rack until softened, about 10 minutes. Remove from oven. (If any moisture gathers in mushroom caps, blot moisture with a paper towel.)

Top mushrooms with onion mixture and cheese. Switch oven to broil and broil stuffed mushrooms until cheese is bubbly and melty, about 2 minutes.
Sprinkle with parsley before serving.


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