Spray an 8-ounce clear microwave-safe container with cooking spray.
Place the sausage, cheese, onion, green bell pepper, red bell pepper, potatoes, and egg into the container.
Mix everything very well.
Place the container in the microwave and cook for 1 minute.
Carefully remove the container and stir.
Cook for an additional 30-45 seconds until cooked through.
Remove the container cautiously from the microwave; it will be very hot.
Allow to cool slightly before serving.
Notes
It's not recommended to freeze homemade Just Crack an Egg cups. They are best when stored in the refrigerator and consumed within 5 days for optimal freshness.