This is a great recipe for meal prep! You can store it in an airtight container in the fridge, and it will keep well for 3 days.  You can also freeze the frittata for up to 3 months. To re-heat, thaw in the fridge overnight and bake in a 350°F oven until heated through. I would avoid reheating in the microwave though because it may let out too much moisture from the vegetables and have a rubbery texture.