Preheat oven to 400°F and grease a 2-quart baking dish.
In a large skillet, cook ground beef over medium heat until no longer pink; drain fat.
Stir in corn, tomato sauce, water, green pepper, and taco seasoning; mix well.
Spoon beef mixture into the prepared baking dish.
Prepare cornbread mix according to package directions for cornbread.
Stir half of the French fried onions into the cornbread batter.
Spread cornbread mixture evenly over the beef mixture.
Bake uncovered for 20 minutes.
Remove from oven and sprinkle with cheddar cheese and remaining onions.
Bake for an additional 3-5 minutes or until cheese is melted and a toothpick inserted into cornbread layer comes out clean.