Quiche is a deliciously brilliant way to use up leftovers. This recipe uses gruyere cheese and bacon with a silky egg and cream mixture. It is seasoned simply with salt, pepper, and fresh herbs. Should you be inclined to get creative with substitutions, here are a few helpful tips: Use lightly cooked vegetables in your filling. Meats should be cooked as if ready to eat. Before baking your quiche, cook a few spoonfuls of your filling in a skillet to check the seasoning and flavor profile. Preparation of Pie Dough, Par-Baked is required before beginning this recipe.