First heat a large skillet over medium-high heat. Brown the sausage crumbling the sausage up as you go.
Once the sausage is browned, drain the grease in a colander. Place browned sausage in a large storage container.
Turn the heat on your pan down to medium to medium-low. Scramble eggs. I will usually leave mine a little soft so they don't turn rubbery when reheating.
Remove eggs and add them to the storage container with the sausage.
Wilt your spinach over low-medium heat, then add it to the eggs & sausage.
Mix until everything is evenly combined.
Store in the refrigerator for up to a week. Reheat portions in the microwave as needed.
Notes
I have also browned my sausage, drained it, put the sausage back into the pan and then added the spinach and eggs to finish cooking everything all toghether. This method works fine the food is just much messier looking and not quite as pretty.
Since different foods are different sizes, nutritional facts are approximate and may not be exact but they are as close to accurate as I can calculate.