This Mushroom Strudel with Leeks and Parmesan Cheese is a savory, flaky pastry perfect for an elegant appetizer or main course. It features a rich filling of cremini and shiitake mushrooms, sautéed with sweet leeks and fresh garlic, all wrapped in buttery phyllo dough and baked to golden perfection. The addition of Parmesan cheese adds a delightful umami depth, making this dish both comforting and impressive for any occasion.