Brown sausage for 5 minutes and add mushrooms and onions. Cook for 5 minutes. In a large bowl, combine eggs and milk. Grease casserole dish with butter and add a layer of Italian Bread, layer of sausage mixture, layer of cheese. Repeat. Add milk and egg mixture over the top and sprinkle with last of cheese. Refrigerate overnight. Bake at 350 for 1 hour until bubbly.
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