Brown ground beef and drain; add to Ragu sauce and simmer for 30 minutes. Remove from heat and cool. Cook pasta according to package directions and drain. Grease bottom and sides of a 9x13 pan. Layer ingredients in this order: pasta, dotted spoonfuls of cottage cheese, sprinkled shredded Mozzarella cheese, and meat sauce.
Continue layering to depth of approximately 1 1/2 inch to 2 inches. After last layering, sprinkle Parmesan cheese generously over the top of the casserole.
Bake at 350 degrees for 40 minutes uncovered on middle rack of oven. MICROWAVE: Use glass pan, cover with plastic wrap, and bake on high for 20 minutes.
