Preheat oven to 400ยบ F.
Brown beef over the stovetop. Drain.
Add bell pepper, taco seasoning, tomato sauce, and water. Bring to a boil, and simmer over low heat.
Prepare corn muffin mix, and add 2/3 cup french fried onions.
Pour meat filling into 2 quart casserole dish, and spread corn muffin mix on top.
Bake uncovered for 20 minutes or until corn bread is done.
Top corn bread with the remaining 2/3 cup french fried onions and 1/2 cup of cheddar cheese.
Bake for an additional 3-5 minutes or until cheese is melted and onions are golden brown.