1 cup (4 ounces) shredded part-skim mozzarella cheese
1 medium ripe avocado, sliced, optional
Cook manicotti according to package directions. Meanwhile, in a large skillet, saute onion in oil until tender. Add garlic; cook 1 minute longer. Stir in the tomatoes, basil, wine, brown sugar, salt and pepper. Bring to a boil. Reduce heat; simmer, uncovered, for 10-15 minutes, stirring occasionally.
Drain manicotti. In a small bowl, combine the ricotta cheese, avocado, Parmesan cheese, salt and pepper. Stuff cheese mixture into manicotti shells. Spread 1 cup sauce into a greased 13-in. x 9-in. baking dish. Arrange manicotti over sauce. Pour remaining sauce over top.
Cover and bake at 350° for 35 minutes or until bubbly. Uncover; sprinkle with mozzarella cheese. Bake 10-15 minutes longer or until cheese is melted. If desired, garnish with avocado slices.