Spraying cupcake liners: Don’t skip this step. Although cupcake liners are not usually coated with cooking spray, for this dense eggy mixture it’s necessary to ensure that the liners will peel off the muffin frittatas.

Quick breakfast solution: Bake muffin frittatas the night before; quickly re-warm in the microwave in the morning.

This recipe is an excellent source of folate, and a good source of choline, vitamin A and protein.