Make the filling

Cup of Yum
1. Put the breakfast sausage in a frying pan over medium heat. Cook it, occasionally stirring, until it is no longer pink.
2. While it cooks, dice the bell pepper and onion. Add the bell pepper, onion, spinach, and salt to the sausage mixture and cook for 2-3 minutes.
3. Let the mixture cool completely and refrigerate in an airtight container for 4-5 days until ready to make the egg cups.

Make the egg cups

1. Put 1/3 cup of the sausage mixture in a medium bowl for a single serving. Add 1 egg and 2 tablespoons of cheese and stir to mix well. To make all the muffins at once, combine all the filling with 5 eggs and 1/2 cup of cheese in a medium bowl.
2. If you make all the egg muffins at once, you will need 10 muffin cups. For a single serving, use 2 muffin cups. Spray the muffin cups with nonstick cooking spray. Divide the egg mixture evenly between the cups. Put them in the air fryer basket and cook at 350 degrees F for 10-12 minutes until they are golden brown and cooked through.