Preheat oven to 350 degrees. Grease a 9×13 casserole dish with cooking spray and set aside.
In a large rimmed skillet, brown beef with onions, peppers and garlic. Drain excess grease. Add corn, beans and tomatoes. Add seasonings and allow beef mixture to cook for a few minutes. Spread beef into the casserole dish and top evenly with cheese. Arrange tater crowns over the casserole.