Found this recipe in Southern Living and it is tastefully good.
Cook pasta according to package directions; rinse with cold water. Drain.
Process tomato sauce and diced tomatoes and chiles in a blender 20 seconds or until smooth. Set aside.
Cook sausage in large skillet over medium to high heat, stirring until meat crumbles and is no longer pink. Stir in cream cheese, ricotta cheese, and 2 cups mozzarella cheese.
Spoon into manicotti shells; arrange stuffed shells in lightly greased 13x9-inch baking dish.
Pour tomato mixture over shells; sprinkle with remaining 2 cups mozzarella cheese.
Bake at 350 degrees for 20 minutes or until cheese is melted and bubbly. Let casserole stand 10 minutes before serving. Sprinkle top with chopped fresh parsley, if desired.