Heat oven to 350°F. Lightly grease 13x9-inch (3-quart) glass baking dish with shortening or cooking spray. Remove pancakes from boxes; unwrap and carefully separate. Set aside to partially thaw.
In large bowl, beat eggs and half-and-half with whisk. Coarsely chop pancakes. Add pancake pieces and chopped sausage to egg mixture; toss to coat. Let stand 5 minutes. Pour mixture into baking dish. Sprinkle with cheese.
Bake uncovered 40 minutes or until edges are set and light golden brown. Let stand 10 minutes. Cut into squares; serve with syrup.