Spray a 5 quart or larger crock-pot OR a 3.5 quart casserole crock-pot with non-stick cooking spray OR line with a Crock-Pot Liner and set aside.
Place waffles in the toaster and toast until lightly browned. Cut or tear each toasted waffle into 1 to 2 inch pieces and set aside.
In a large frying pan set over medium-high heat on the stove-top brown and crumble the breakfast sausage. Drain off excess cooking fat and set browned sausage aside.
In the bottom of your slow cooker layer in half of the toasted waffle pieces, then half of the browned sausage crumbles, sprinkle on 1 cup of cheese and pour half of the egg mixture over top.
Create another layer exactly like the first layer with waffle, sausage, eggs and finishing with a layer of cheese.
Using a flat spatula push the waffle pieces into the crock-pot into the egg mixture so that each waffle piece is in the egg mixture at least a little bit.
Cover and cook on HIGH for 3 to 4 hours or until egg mixture is cooked through and cheese is melted.
Cut slices of casserole to serve and offer warmed maple syrup to drizzle over each slice before eating.