Crockpot Brunch Casserole

Crock pot Brunch Casserole Recipe
What you need:
1 1/2 lb Ground beef
1  Onion — large; finely chopped
2 tb Olive oil or butter
2  Garlic — cloves; minced
1 4oz can Mushrooms — sliced; drained
2 tsp Salt
1/2 tsp Nutmeg
1/2 tsp Oregano — leaf
1/2 pk Spinach — chopped; frozen (thawed and drained)
3 tbsp Flour
6  Eggs — beaten
1/4 c Milk [...]