Gruyere Spinach Casserole is a delicious and comforting dish made with layers of creamy spinach, Gruyere cheese, and a crispy breadcrumb topping. The spinach is sautéed with garlic and onions, then mixed with a creamy sauce made from Gruyere cheese, milk, and eggs. The mixture is then topped with a mixture of breadcrumbs and Parmesan cheese, and baked until golden and bubbly. This casserole is perfect as a side dish or a main course, and is sure to be a hit with both kids and adults alike.