French Onion Tartlets
French onion tartlets are a savory holiday appetizer made with flaky puff pastry, caramelized onions, and melted Gruyère cheese, perfect for Thanksgiving, Christmas, or New Year’s.
Ingredients
- 3 tablespoons Butter
- 1 tablespoon Olive Oil
- 2 Large Yellow Onions thinly sliced
- Salt to taste
- ½ teaspoon White Granulated Sugar
- 1 teaspoon Worcestershire Sauce
- ½ teaspoon Dried Thyme
- ¼ teaspoon Black Pepper
- ¼ cup Beef Broth
- 2 Puff Pastry Sheets thawed
- 1 Large Egg
- 1 tablespoon Water
- ½ cup Gruyère Cheese shredded
- Fresh Thyme optional for garnish
Instructions
- Add butter and olive oil to a large skillet over medium-low heat. Add the onions and season with salt. Cook for 30–40 minutes, stirring occasionally, until the onions are deeply golden and caramelized. Drain any excess grease from the pan. Add sugar and let it become jammy.
- Add the Worcestershire sauce, thyme, black pepper, and beef broth. Cook for another 3–5 minutes, until the liquid has mostly evaporated.
- Preheat the oven to 400°F. Line 2 baking sheets with parchment paper or silicone baking mats.
- Roll out the puff pastry sheets into 9x12-inch rectangles. Use a 2 ½ to 3-inch circle cookie cutter or pastry cutter to cut circles from the sheets. Avoid going smaller than this because they will shrink as they bake.
- Place the circles on each prepared baking sheet. Pierce the circles with a fork to prevent air bubbles as they bake. Brush each circle with egg wash (1 egg + 1 tablespoon of water, scrambled).
- Bake for 6 minutes, until they are puffed up. Remove from the oven and use a small circle, like the bottom of a shot glass, to indent each puff pastry. If you can't find a small circle, use the back of a spoon. Be sure not to press all the way through.
- Fill the center of each circle with caramelized onions. Top each with shredded gruyère cheese.
- Bake for 5-6 minutes, until the cheese melts and the shells are crisp.
- Garnish with fresh thyme, if desired.
Nutrition
Calories: 149kcalCarbohydrates: 10gProtein: 3gFat: 11gSaturated Fat: 4gPolyunsaturated Fat: 1gMonounsaturated Fat: 6gTrans Fat: 0.1gCholesterol: 14mgSodium: 93mgPotassium: 38mgFiber: 0.5gSugar: 1gVitamin A: 81IUVitamin C: 1mgCalcium: 34mgIron: 1mg