Drain tomatoes reserving juice; set aside. In a small saucepan, bring water to a boil. Add quinoa. Reduce heat; cover and simmer for 12-15 minutes or until liquid is absorbed.
Meanwhile, cut peppers in half lengthwise and remove seeds. In a Dutch oven, cook peppers in boiling water for 3-5 minutes. Drain and rinse in cold water; invert onto paper towels.
In a large skillet, cook the beef, onion, parsley, paprika, salt, pepper flakes and pepper over medium heat until meat is no longer pink. Add garlic; cook 1 minute longer. Stir in one can tomato sauce, corn, quinoa and tomatoes; heat through.
Spoon into pepper halves. Place in a 13-in. x 9-in. baking dish coated with cooking spray. Combine the reserved tomato juice and remaining tomato sauce; pour over peppers.
Cover and bake at 350° for 30-35 minutes or until peppers are tender. Sprinkle with cheese; bake 5 minutes longer or until cheese is melted. Yield: 4 servings.