Cook pasta according to package directions. In small saucepan, saute onion and garlic in oil until tender. Stir in tomatoes, basil, oregano, sugar and pepper. Bring to boil. Reduce heat; simmer, uncovered, for 15 minutes. Drain pasta; stir into saucepan.
Transfer to greased 1-qt. baking dish. Top with cheeses. Bake, uncovered, at 375° for 10-15 minutes or until cheese is melted. Makes 2 servings.