Preheat oven to 350 degrees. Lightly grease a 9×13 baking dish.
Cook sausage and onion over medium high heat until brown. Drain and set aside.
In a medium bowl, mix corn bread mix, cream style corn and water.
Cover the bottom of the prepared baking dish with about ½ in. of the corn bread mixture.
Layer with sausage and onion mixture followed by optional diced jalapenos. Cover with cheese. Top with remaining corn bread mixture.
Bake 35 minutes or until a toothpick inserted in the center comes out clean.