Bring a large pot of salted water to a boil. Cook pasta according to directions. Drain and set aside.
Add to a blender: marinara sauce, cottage cheese, Parmesan, butter, and red chili pepper flakes if using. Blend until smooth.
Stir pasta sauce into pasta and serve. Serve with meatballs and a veggie side such as fresh salad or pan roasted seasoned vegetables.
