Preheat oven to 375 degrees F. Spray 9 x 13-inch baking dish with non-stick spray, set aside.
In a large bowl, combine corn muffin mixes, 2 eggs, and milk then set aside.
In a separate bowl, combine yellow cake mix, 1 egg, cold water, and beat with a mixer at high speed for 3-4 minutes. Fold corn muffin and cake mixes together until blended thoroughly. Pour combined mixtures into prepared pan. Bake 30-35 minutes. Cut into squares. Serve warm or at room temperature.