Caramelized Onion and Gruyère Stuffed Mushrooms Recipe
These Caramelized Onion Gruyère Stuffed Mushrooms are a savory appetizer featuring juicy mushrooms filled with sweet, slowly caramelized onions and topped with gooey melted Gruyère cheese. Perfectly baked until golden and bubbling, they make a delightful starter or party snack.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Total Time: 60 minutes
- Yield: 20 stuffed mushrooms (serves 4-6 as appetizer) 1x
- Category: Appetizer
- Method: Baking
- Cuisine: French-inspired
- Diet: Vegetarian
Ingredients
Scale
Mushrooms
- 20 large white or cremini mushrooms, stems removed and reserved
Filling
- 2 large onions, thinly sliced
- 2 tablespoons unsalted butter
- 1 cup grated Gruyère cheese
- Salt, to taste
- Freshly ground black pepper, to taste
Instructions
- Prepare the mushrooms: Preheat your oven to 375°F (190°C). Clean the mushrooms by wiping them with a damp cloth and carefully remove the stems, setting the caps aside for stuffing.
- Caramelize the onions: In a large skillet, melt the butter over medium heat. Add the thinly sliced onions and a pinch of salt. Cook slowly, stirring occasionally, for about 25-30 minutes until the onions are deeply golden brown and sweetly caramelized. Season with pepper.
- Make the filling: Chop the reserved mushroom stems finely and add them to the caramelized onions. Stir to combine and cook for an additional 2-3 minutes until the stems soften. Remove from heat and let cool slightly. Mix in half of the grated Gruyère cheese.
- Stuff the mushrooms: Using a spoon, fill each mushroom cap generously with the onion and Gruyère mixture. Sprinkle the remaining Gruyère cheese evenly on top of each stuffed mushroom.
- Bake the stuffed mushrooms: Arrange the stuffed mushrooms on a baking sheet lined with parchment paper. Bake in the preheated oven for 15-18 minutes or until the cheese has melted and turned golden brown.
- Serve: Remove from the oven and allow to cool for a few minutes before serving warm as a delicious appetizer or side.
Notes
- Choose firm mushrooms with a rounded cap for easy stuffing.
- For extra flavor, add minced garlic or fresh thyme to the caramelized onions.
- This recipe can be prepared ahead; assemble the mushrooms and refrigerate before baking.
- Gruyère cheese can be substituted with Emmental or mozzarella if desired.
- Serve with fresh herbs for added color and freshness.
Keywords: stuffed mushrooms, caramelized onions, Gruyère, appetizer, baked mushrooms, easy party snacks
