Coat a 12-ounce microwave-safe coffee cup with cooking spray. Add hash browns. Microwave on high for 1 minute.
In a small bowl, combine the egg, milk, sausage and cheese; pour over hash browns. Stir until blended.
Microwave on high for 30 seconds. Stir. Microwave 30 seconds longer or until eggs are set. Serve with salsa if desired.
Find recipes with ingredients that you have on hand.