- Preheat oven to 350. 
- Add water to Cheesy Cheddar Mix to make soup but do not heat. 
- Brown ground beef, celery, garlic, and onion in skillet; drain fat and water. 
- Stir in remaining ingredients, except green peppers and cheese and simmer for about 10 minutes. 
- Parboil the peppers in boiling water for 3 minutes and drain. Place peppers in baking dish. 
- Stir half of Cheesy Cheddar into hamburger mixture, and then fill peppers with meat. 
- Top meat with remaining Cheesy Cheddar. Bake for 15-20 minutes until cheese is hot and bubble, and peppers are tender to the touch.