Grease a 2-quart casserole dish.
Layer ½ of the waffle pieces into the bottom of the casserole dish.
Top with ½ of the browned sausage, and ⅓ of the cheese.
Repeat with remaining waffles, sausage, and ⅓ of the cheese.
Mix the eggs, milk, dry mustard, salt, and pepper together in a medium bowl.
Carefully pour the egg mixture into the casserole dish. Cover the casserole dish with plastic wrap and refrigerate.
Preheat over to 350 degrees F.
Cover the casserole loosely with foil and bake for 40 minutes.
Remove the foil, top with the remaining cheese, and bake for 10 to 15 more minutes, or until the eggs have completely set. 9. Top with maple syrup if wanted
