Preheat oven to 350.
Cut tops off of bell peppers and clean the seeds and insides out. Boil all four peppers for 4-6 minutes on each side. Remove from water and place upside down on a paper towels to remove any excess water.
Meanwhile, on medium-high heat, brown turkey in 1 tbsp olive oil and a pinch of salt (salt is optional) in skillet, then add onions. After onions are soft, add 2 tbsp water, black pepper, cumin and chili powder. Mix and let simmer for 5-6 minutes, stirring occasionally until thickened.
While browning turkey, in small saucepan, bring 8 tbsp water to boil, add vinegar and simmer for 2 min. Turn heat down to medium-low, then add crushed tomatoes, tomato soup, garlic powder, cayenne pepper, sugar and 1/2 tbsp olive oil. Mix well and let simmer for 3-5 minutes.
Spray 9x9 casserole with olive oil cooking spray. Place peppers right side up in casserole and fill each pepper with 1/4 cup of brown rice. Add 1 tbsp tomato mixture in each pepper. Then add meat/onion mixture. Drizzle small amounts of tomato mixture over all four peppers. Set aside remaining sauce.
Spray foil with cooking spray and cover peppers, cook for 20-25 minutes. Remove from oven and sprinkle each pepper with shredded cheese. Place in oven for 5 minutes.
Remove from oven. Let stand for 5 minutes, and drizzle remaining tomato mixture over peppers. Serve with a dollop of sour cream - (optional).
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