Prepare corn bread batter according to package directions. Spread into a greased 11-in. x 7-in. baking dish.
In a large skillet, cook beef over medium heat until meat is no longer pink; drain. Add the tomatoes, vegetables, tomato paste and seasoning. Bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes. Pour over top. Sprinkle with cheese.
Bake, uncovered, at 350 degrees F for 25-30 minutes or until golden brown. Sprinkle with onions.