Tummy-Pleasing Pie

Preheat oven to 375°F (190°C). Grease an oven-proof casserole dish; set aside. Heat a large, deep skillet over medium-high heat. Add beef and onion; sauté, breaking up lumps with a wooden spoon, until beef is no longer pink, about 7 minutes. Drain off excess fat and return to heat. Add tomatoes, corn, ketchup, chili powder and cumin; mix well. Lower heat and simmer for 10 minutes. Season with salt to taste. Pour into casserole. Prepare corn bread batter according to package instructions. Pour on top of beef mixture; top with cheese. Bake until top is firm, about 20 minutes. Serve with salsa or sour cream.