Preheat Oven and Prep Pan:
Heat the oven to 350°F (175°C). Coat a 12-cup muffin pan with non-stick spray; reserve.Brown the Sausage:
Brown the sausage in a skillet over medium-high heat, breaking it up, until fully cooked. Discard the grease and let the sausage cool a bit.Mix Egg Mixture:
In a large bowl, whisk the eggs lightly. Stir in the shredded cheese, Bisquick, and cooled sausage until combined.Fill Muffin Cups and Bake:
Spoon the mixture into the prepared muffin cups, filling each about ¾ full. Bake for 18-20 minutes, until tops are golden.