This savory quiche is a great way to use up leftover green beans and bacon. The quiche starts with a homemade or store-bought pie crust, then adds a filling made with sautéed onions, garlic, green beans, and bacon. The filling is mixed with eggs, milk, and grated cheese, then poured into the crust and baked until golden and set. The result is a delicious and satisfying quiche that is perfect for brunch or dinner.