Traditional Bulgarian Cheese and Onion Quiche

Method

1. Preheat the oven to 375°F (190°C).
2. Roll out the puff pastry and place it in a pie dish.
3. In a pan, sauté the onion in butter until caramelized.
4. In a bowl, mix the eggs, sour cream, salt, and pepper.
5. Layer the cheese and onions in the pastry, then pour the egg mixture over the top.
6. Bake for 25-30 minutes until golden and set.