Mexican Polenta Casserole

Mexican Polenta Casserole:
9×13 pan
1 medium chopped onion
1 lb. 93% lean ground beef
2 tsp. cumin
1 tsp. chili powder
1-2 cups tomato sauce
prepared polenta (1 tube or about 2 cups cooked)
1 lb. can spicy refried FF beans (I use Garden of Eden black)
6 slices SoyaKaas jalapeno Mex-Kaas soy cheese
Brown onion and meat. Add spices (or use packet of [...]