Prepare a mini muffin tin by spraying with non-stick cooking spray.
In a large bowl, combine eggs, cheese, onion, spinach, quinoa, sausage, salt and pepper.
Spoon mixture into the muffin tins, filling to the top of each cup.
Bake for 15-20 minutes, or until the edges turn golden brown.
Cool for 2-5 minutes before removing from the tin.
Notes
If you would like to freeze them, place the cups on a baking sheet and place in the freezer until solid. Place them in a freezer bag to store. Microwave 30-40 seconds to reheat.