Mix the eggs, cream cheese and most of the shredded cheese together reserving some of the cheddar cheese for the topping.
Fold the sausage and onions into the cheese mixture and set aside
Preheat the oven to 350 degrees F
Generously spray a casserole dish or tin foil pan with non-stick cooking spray
Layer the pan with the meat and cheese mixture first and add the grits to the top
Sprinkle with the remainder of the cheddar cheese on top.
Optional: You can add a few pats of butter and or to make it look pretty you can sprinkle some paprika and or dried parsley on top. You can also reverse the casserole by placing the grits on the bottom and the cheese on the top, either way, it is delish!