Caramelized Onion and Mushroom Tarte Tatin is a savory twist on the classic French dessert. This dish features a buttery puff pastry crust topped with sweet caramelized onions and earthy mushrooms. The onions and mushrooms are cooked until golden brown and then baked until the pastry is golden and crispy. The combination of the sweet onions, savory mushrooms, and flaky pastry creates a delicious and satisfying dish that is perfect for brunch or a light dinner.