Preheat oven to 350ºF. In a large bowl, combine cake mix, 2 eggs, and butter; beat 2 minutes. Spread batter into a greased and floured 9x13-inch glass baking dish. In a small bowl, beat 2 eggs, confectioners sugar, and cream cheese until smooth. Spread over cake batter. Bake 35 to 40 minutes, or until cake begins to pull away from sides of pan. Cool completely on a wire rack. Store in an airtight container. Serves 10-12.