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HEAT oven to 350ºF.
COOK pasta as directed on package.
HEAT oil in large skillet. Add onions, peppers and garlic; saute until soft, about 5 min. Add beef and brown it. Add diced tomatoes, marinara sauce, 2 Tbsp. Parmesan and seasonings. Simmer 10 min.; combine with pasta.
SPOON half the pasta mixture into greased 3-qt. casserole dish; cover with half the VELVEETA. Repeat layers. Bake, covered, 15 min. Remove cover; stir. Bake 5 to 10 min. or until heated through. Sprinkle with remaining Parmesan.