Preheat oven to 400. Grease 9 x 13 inch casserole dish. Brown ground meat and chopped onions in skillet and drain. Add ranch style beans,rotel tomatoes and corn. Season with salt and pepper. Heat well. I puree my rotel tomatoes because my family doesnt like the chunky tomatoes.
Put meat mixture in casserole dish. Top with grated cheese evenly on top.
On separate bowl mix cornbread mixes as directed on package. Bake in 400 degree oven until cornbread mix is golden brown on top and done.