This savory tart uses frozen puff pastry, mushrooms, and caramelized onions, topped with thyme for a luxurious, easy-to-make dish.
Prep Time 20 minutes mins
Cook Time 30 minutes mins
Total Time 50 minutes mins
For a vegan version, replace cheeses with vegan alternatives and use olive oil instead of egg on crust. Add toppings like truffle oil or toasted pine nuts for extra flavor.