4.5 from 327 votes
Caramelized Onion, Mushroom & Gruyere Tartlets
These tartlets feature puff pastry rounds topped with caramelized onions, sautéed mushrooms, garlic, and thyme, finished under the oven to melt shredded Gruyere cheese. The combination delivers a rich, savory balance of sweet onions, earthy mushrooms, and creamy cheese in a crisp, flaky pastry shell. White wine or broth deglazes the pan to concentrate the filling’s flavor before baking.
Prep Time
20 mins
Cook Time
40 mins
Total Time
1 hr
Servings:
16
3-inch tartlets
Calories:
71 kcal
Course:
Appetizer
Cuisine:
American
Ingredients
- 1 tablespoon olive oil
- 1 yellow onion thinly sliced, large
- 1 tablespoon butter unsalted
- 16 ounces white button mushrooms thinly sliced
- 1 clove garlic chopped
- ½ teaspoon thyme dried
- salt to taste
- black pepper to taste
- ¼ cup white wine can substitute chicken or vegetable broth
- 2 puff pastry thawed according to directions on package, sheets
- 1 cup gruyere cheese can substitute any variety of Swiss cheese, shredded
- 1 egg beaten together (for the egg wash, + 1 tablespoon water
- parsley chopped, handful
Instructions
- Preheat oven to 400 degrees F and line two baking sheets with parchment paper.
- Heat the olive oil in a wide, heavy-bottomed pan over medium-low heat and add the onions. Cook, stirring occasionally, until they begin to caramelize, about 20 minutes.
- Add the butter to the pan. Once melted, add the mushrooms and saute, stirring occasionally, until they are completely soft and all of the liquid evaporates, about 20 minutes.
- Add the garlic and the thyme and saute until fragrant, about 1 minute. Season with salt and pepper to taste.
- Add the wine, scraping the bottom of the pan to pull up all of the browned bits, and cook until all of the liquid has evaporated. Remove from heat.
- Unfold the thawed sheets of puff pastry and cut out circles from the dough, placing them evenly spaced on the baking sheets. Using a very sharp knife, make four small scores around the perimeter of the dough, about ¼ to ½-inch from the edge.
- Top the rounds of puff pastry with a small spoonful of the onion and mushroom mixture, trying to keep the filling within the score marks. Top with the shredded Gruyere cheese. Brush the edges of the dough rounds with the egg wash.
- Bake until the pastry is golden brown, about 15 to 25 minutes. Garnish with fresh chopped parsley.
Cup of Yum
Nutrition Information
Calories
71kcal
(4%)
Carbohydrates
2g
(1%)
Protein
3g
(6%)
Fat
5g
(8%)
Saturated Fat
2g
(10%)
Cholesterol
21mg
(7%)
Sodium
38mg
(2%)
Potassium
113mg
(2%)
Vitamin A
140IU
(3%)
Vitamin C
1.6mg
(2%)
Calcium
87mg
(9%)
Iron
0.3mg
(2%)
Nutrition Facts
Serving: 16 3-inch tartlets
Amount Per Serving
Calories 71
% Daily Value*
| Calories | 71kcal | 4% |
| Carbohydrates | 2g | 1% |
| Protein | 3g | 6% |
| Fat | 5g | 8% |
| Saturated Fat | 2g | 10% |
| Cholesterol | 21mg | 7% |
| Sodium | 38mg | 2% |
| Potassium | 113mg | 2% |
| Vitamin A | 140IU | 3% |
| Vitamin C | 1.6mg | 2% |
| Calcium | 87mg | 9% |
| Iron | 0.3mg | 2% |
* Percent Daily Values are based on a 2,000 calorie diet.