Wild Mushroom Tartlets

Name: Wild Mushroom Tartlets
Ingredients: 1 packet puff pastry; 2 pound wild mushrooms ( or whatever is available); 2 tablespoon butter; 1 piece garlic, minced; 5 sprig fresh thyme; 1 sweet onion; 5 tablespoon olive oil; 2 tablespoon balsamic vinegar; 1 cup ricotta; 1/2 cup parmesan cheese; 1/2 cup creme fraiche; 1 egg; salt and pepper to taste