Half and clean the peppers and cook in microwave for about 2 min, or until just slightly softened.
Place peppers in 9x13" baking pan; or one of a size that holds everything.
Sauté the onions and the ground beef.
Mix all ingredient together and pour over peppers.
Preheat oven to 350*.
Place pan in oven and bake for 45min., or until the peppers are cooked through.
As desired, add more cheddar on top of the peppers near end of cooking and let melt.