Preheat oven to 400° Fahrenheit and grease a 9x13 baking dish with ghee.
Spread the shredded potatoes (hash browns) out in the baking dish. Place in the oven to bake for 10 minutes.
While the potatoes start to bake, prepare onion and spinach as noted and make the sauce.
To make the sauce, place all of the sauce ingredients in a high powered blender. Blend until smooth and creamy and set aside.
After the potatoes have cooked for 10 minutes, remove the baking dish from the oven. Add the onion and spinach to the dish. Pour the creamy sauce over everything. Using a spoon or spatula, mix the ingredients together so the sauce mixes in with everything.
Add the sausage links on top of the casserole. Place back into the oven to bake for 20 minutes. If desired, turn the oven to broil for the last 3-4 minutes to brown the top of the sausages.
Remove from the oven and top with diced chives (optional). Allow to cool for a few minutes before serving. Enjoy.
Notes
For Whole30 compliance, make sure your frozen shredded potatoes are only potatoes. These brands are Whole30 compliant.