This Caramelized Onions and Mushrooms Tart with Blue Cheese is a savory and indulgent dish that is perfect for any occasion. The tart features a buttery and flaky crust filled with a rich and creamy mixture of caramelized onions, saut茅ed mushrooms, and tangy blue cheese. The sweetness of the caramelized onions pairs perfectly with the earthy mushrooms, while the blue cheese adds a bold and savory flavor. Serve this tart as an appetizer or main course, and watch it disappear in no time!