Up to 2 days ahead, make the mushroom topping. Place a large sauté pan over medium-high ... On a lightly floured counter, unfold the puff pastry and use a rolling pin to roll a few times to ...

3. Heat the butter in a large frying pan. Add the onion and garlic, cooking for 5 minutes to soften. Add the mushrooms and thyme, cooking slowly for 8-10 minutes, allowing all the juices to reduce.