Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 inch baking pan.
Place the muffin mix a large mixing bowl. Stir in the milk and egg. Mix in the cream corn and sugar. Pour batter into prepared pan.
Bake in preheated oven for 30 minutes, or until a knife inserted into the center of pan comes out clean.