1In 2-quart saucepan, heat water to boiling over medium-high heat. Stir in rice. Reduce heat to low. Cover; simmer 15 minutes or until liquid is absorbed and rice is tender.
2Heat oven to 375°F. In medium bowl, mix sausage, beans, tomatoes, 1 cup of the cheese and the cooked rice. Place pepper halves, cut sides up, in ungreased 13x9-inch (3-quart) glass baking dish. Spoon about 2/3 cup rice mixture in each pepper half, mounding as necessary.
3Cover tightly with foil; bake 35 to 40 minutes or until peppers are crisp-tender and filling is thoroughly heated. Uncover; sprinkle tops of peppers with remaining 1/2 cup cheese and the onions. Bake uncovered 5 minutes longer or until cheese is melted.