Quiche fits the bill any time of day, be it breakfast, brunch, lunch, or dinner. You can make it rich and decadent, with the butteriest crust and heaps of cheese, or you can lighten it up and pack it with flavorful veggies. Whichever way you choose, it’s a guaranteed hit. That is, as long as you avoid a few common quiche-making mistakes. Baking a quiche is really quite simple. In its most basic form, it’s a custard of eggs and milk baked in a pie crust.