Line a 13 x 9 baking dish with ground sausage to create a bottom layer. If you prefer, you can precook the sausage to brown it. Otherwise, it will cook while being baked but won't brown.
In a large bowl, whisk together eggs, cream and cheese.
Stir in spinach and onion into egg mixture.
Pour over sausage in baking dish.
Bake at 375⁰ F for 35 minutes or until eggs are browned and firm.
Recipe by Angela Atkins at https://yourhealthunbound.com/egg-and-spinach-breakfast-casserole/