If you’re a fan of the rich, savory flavors of French onion soup and the earthy taste of mushrooms, this French Onion Mushroom Tart is going to be your new favorite. This tart combines the sweet caramelized onions, sautéed mushrooms, and gooey melted cheese in a flaky puff pastry crust that’s pure comfort in every bite. It’s perfect for brunch, lunch, or even as a light dinner, served with a fresh green salad. This tart is all about those deep, comforting flavors that make you want to curl…