Preheat oven to 350ºF. Lightly grease a round casserole dish. In a medium bowl, combine first six ingredients. When well-combined, add cornbread mix and stir. Pour into dish. The batter should fill the pan, leaving 1/2 inch at the top, as the mixture will rise in the oven. Bake for approximately one hour, or until firm in the center. (If you prefer the casserole a little creamier, bake for about 50 minutes.) Casserole will deflate slightly while cooling.
