Let puff pastry sheets thaw on the kitchen counter.
2
Mince the garlic and add to a small bowl along with creme fraiche, salt and pepper. Mix well and set aside.
3
Thinly slice the onion and mushrooms, and fry in a frying pan with oil or butter until the onion is caramelised and the mushroom has reduced in size.
4
Place the puff pastry sheets on a baking sheet. Create a large rectangular shape, make sure they overlap a little, and then roll them together with a rolling pin. Make a few holes in the dough with a fork. Top with the crème fraîche mixture, mushrooms mix, and grated parmesan. Bake in the middle of the oven at 220 degrees celsius for about 12-15 minutes.
