Cook radiatore as package, drain. Preheat oven to 375'. In a large skillet, over medium heat, brown sausage; pour off fat. Add onion and garlic. Cook until onion is tender. Stir in pasta sauce and pepper. Bring to a boil; reduce heat and heat simmer 10 minutes. Remove from heat; stir in radiatore and 1/2 cup cheese. Turn into greased 11x7-inch baking dish. Top with remaining 1 cup cheese. Bake uncovered 30 minutes or until hot and bubbly.