Spray 13x9-inch (3-quart) baking dish with nonstick cooking spray. In medium nonstick skillet over medium heat, cook sausage until no longer pink. Drain well; set aside.
In large bowl, combine egg product, sour cream, dry mustard and onion; blend well. Stir in bread cubes, cheese and sausage. Pour into sprayed dish; sprinkle with paprika. Cover with plastic wrap. Refrigerate at least 4 hours or overnight.
Heat oven to 350°F. Uncover dish; bake 45 to 55 minutes or until center is slightly puffed and knife inserted in center comes out clean.