This moist and delicious cornbread casserole features three kinds of corn: whole kernels, cream-style, and corn muffin mix. It's easy to make and brings something interesting to an everyday meal, combining a bread with a vegetable for a tasty side dish. The casserole is versatile as well and is the perfect base for adding cooked crumbled bacon, sauteed peppers, or shredded cheese. Serve a square of this cornbread casserole with meat or seafood and a steamed green vegetable or salad for a complete and satisfying meal.