Caramelized-Onion and Gruyere Tarts

Ingredients

• 3 c. grated Gruyère cheese
• 8 oz. cream cheese
• 1 tbsp. Dijon mustard
• 1 tbsp. Chopped fresh oregano
• ¾ tsp. fresh ground pepper
• 2 tbsp. unsalted butter
• 2 large sweet yellow onions
• 2 tbsp. fresh thyme
• 1 recipe Country Living's Quick Puff Pastry
• ½ c. Kalamata olives

Directions

1. Make the tarts: Heat oven to 400 degrees F. Mix Gruyère, cream cheese, mustard, oregano, and pepper in a small bowl and set aside. Melt butter in a large skillet, add onions, and cook, stirring occasionally, over medium-low heat until dark brown and caramelized -- about 1 hour. Stir in the thyme and set aside. With a sharp knife, cut the puff pastry dough into 8 equal-sized pieces. Roll each piece out to 8- by 6-inch rectangle. Spread about 1/4 cup of the cheese mixture on the dough, leaving a 1/2-inch border all the way around. Top with 1/4 cup of the caramelized onions and 1 tablespoon of the olives. If freezing, skip to Step 2 or bake tarts on parchment-lined baking pans for 10 minutes, reduce oven temperature to 375°F, and bake until puffed and golden -- about 12 more minutes.
2. Freeze the tarts: Place uncooked tarts on parchment-lined baking pans, cover with plastic wrap, and freeze until solid -- about 2 hours. Wrap each frozen tart securely in freezer paper or aluminum foil and stack them in an airtight container. Store frozen for up to 2 months. To serve, bake frozen tarts at 400°F for 12 minutes, reduce oven temperature to 375°F, and bake until puffed and golden -- about 15 more minutes.

Source: countryliving.com