Ingredients

• 1 tablespoon butter
• 0.5 cups onion
• 1 cup apple
• 2 teaspoons balsamic vinegar
• 1 , 1.9 ounce
• 3 ounces Brie cheese , or as needed, rind removed
• 2 tablespoons chopped walnuts
• 2 tablespoons caramel sauce
• 1 teaspoon fresh thyme leaves
• sea salt , for garnish

Instructions

1. 1 Preheat the oven to 400 degrees F (200 degrees C). Line a 10x15-inch rimmed baking sheet with parchment paper.
2. 2 Melt butter in a skillet over medium heat. Add onion and cook, stirring often, until golden brown and tender, about 10 minutes. Add apple and cook, stirring occasionally, until just beginning to soften, about 4 minutes. Stir in vinegar and cook 30 seconds more.
3. 3 Arrange tart shells on prepared baking sheet. Cut Brie into 15 small pieces and put one piece into each shell. Evenly fill with apple mixture. Sprinkle with walnuts.
4. 4 Bake in the preheated oven until cheese is melted and tart shells are golden, 12 to 15 minutes.
5. 5 Meanwhile, stir together caramel sauce and thyme in a small bowl. Microwave until warmed, about 15 seconds. Drizzle tarts with caramel mixture and garnish with flaky salt.

Nutrition per serving