This crustless spinach and Gruyere quiche with prosciutto is a delicious and healthy twist on the classic quiche. The combination of creamy Gruyere cheese, savory prosciutto, and nutritious spinach creates a flavorful and satisfying dish. Without the crust, this quiche is lower in calories and carbohydrates, making it a great option for those following a low-carb or gluten-free diet. Serve it for breakfast, brunch, or even dinner, and enjoy the rich and cheesy goodness without the guilt!