• In a nonstick skillet, cook sausage and onion over medium heat until sausage is no longer pink; drain and cool. In a large bowl, beat the eggs, egg whites, milk, mustard, salt and pepper. Stir in the bread cubes, cheese and sausage mixture. Pour into a 13-in. x 9-in. baking dish coated with cooking spray. Cover and refrigerate overnight.
• Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 350° for 35-40 minutes or until a knife inserted near the center comes out clean. Let stand for 5 minutes before cutting.
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