Preheat oven to 350F. In a bowl, whisk eggs, and add spices.. Set aside.
Heat skillet on medium heat and begin to break sausage into crumbles in skillet, with a spatula. When sausage is almost done, add fresh spinach gradually, a few handfuls at a time, until spinach wilts. Use entire bag, as spinach will cook down.
Add 1-2 spoonfuls of sausage/spinach combo into each muffin cup. Pour in egg mixture until cup is ¾ full. Top with shredded cheese.
Bake for 25-30 minutes. Remove from oven and allow to cool 4-5 minutes, before removing from muffin cup tin. Can be made in advance.