Preheat oven to 350 degrees. Coat a 9 x 9” pan with cooking spray.
In a large nonstick pan, brown the beef; drain off fat. Stir in undrained tomatoes and corn; heat completely. Transfer to the baking pan and spread evenly. Sprinkle with ¼ cup of cheese evenly over the top.
To make corn bread topping: In a medium bowl, combine corn muffin mix, egg and milk. Mix just until combined but do not over mix. Some lumps are okay. Using a rubber spatula, evenly spread over beef mixture. Sprinkle remaining ¼ cup cheese evenly over the top.
Bake, uncovered, 30 minutes or until topping is set. Let stand 5 minutes before slicing into 6 slices.
Optional: Top each slice with chopped tomatoes, a dollop of yogurt and a little olives, if desired.
This casserole freezes great!