Place in the bottom of a greased 9x13” baking dish.
Crumble cooked sausage over top.
Sprinkle cheddar cheese over top.
Combine eggs and milk.
Pour evenly over top of cheese in casserole dish.
Sprinkle with salt and pepper.
Prepare gravy mix according to package directions.
Once thickened, spread over top of the cheese mixture in baking dish.
Cover and refrigerate overnight.
Bake at 350° approximately one hour or until bubbly and cooked through.
NOTE: The directions for my gravy mix called for 1 ½ cups of water to be brought to boiling. Stir the contents of the gravy mix into ½ cup water and whisk to incorporate. Once water comes to a boil, add gravy/water mix and whisk until thickened. (I was making four packages at once so it took about 5 minutes for the gravy to thicken appropriately).NOTE: Preparation time does not include time required to refrigerate overnight.NOTE: You can also bake this casserole immediately without refrigerating it overnight. Bake time will probably shorten to 30-45 minutes.