Cut tops off peppers, and remove seeds. Cook tops and bottoms of peppers in boiling water 5 minutes. Drain peppers; set aside.
Combine rice and next 5 ingredients in a medium bowl; stir in 1 cup cheese. Spoon mixture evenly into peppers, and replace pepper tops; place in an 11x7x2-inch baking dish. Add hot water to dish to a depth of 1/2 inch.
Bake, uncovered at 350 degrees F. for 25 minutes. Sprinkle evenly with remaining 1/2 cup cheese; bake an additional 5 minutes or until cheese melts.