Add in grain/rice and just enough jarred sauce to moisten mixture. Stuff peppers, and place in a baking pan, with remaining sauce poured over top. Bake in 350 oven about 30-45 minutes. Peppers should be softer, but still holding shape. Top with cheese, cook about 5 minutes more, until cheese is melted, or place under broiler for about 1-2 minutes until cheese melts. Serves 4.