Caramelized Onion Tarts

And this one was a big hit on Christmas. Adapted from a recipe in Real Simple.

2 tbsp olive oil
2 medium onions, sliced
2 red apples (such as Gala or Braeburn), cut into small pieces
salt and pepper
2 sheets frozen puff pastry (from a 17.3 ounce package), thawed
1/2 cup creme fraiche or sour cream (I used plain soy yogurt)

1. Heat oven to 400.

2. Heat the oil in a large skillet over medium heat. Add the onions and cook until soft and golden brown, 12-15 minutes. Stir in the apples, 1/s tsp salt, and 1/4 tsp pepper, and cook until just tender, about 2 minutes.

3. Place each sheet of puff pastry on a parchment lined baking sheet and prick all over with a fork. Spread with creme fraiche (or whatever you're using), leaving a 1/2 inch border. Top with the onion mixture and bake until the pastry is crisp and browned, 30-35 minutes.

4. Cut into pieces before serving.