Cream spaghetti casserole The perfect Sunday dinner! Cook 1pk spaghetti according to directions. Brown 2lb ground beef & 1/2c onion, S&P to taste. Stir in 2 large cans spaghetti sauce, 16oz sour cream & 1 cup mozzarella. Mix well. Add spaghetti & mix. Pour into greased casserole dish. Top with 1 cup mozzarella & 1/2 cup Parmesan. Cover & bake at 350° for 30 minutes. #LTKxPrime