Cook manicotti shells in boiling water until barely cooked as
directed on package. Rinse with cold water; drain.
Combine cottage cheese, cream cheese, 1/4 cup of the Parmesan cheese, parsley, egg, onion and salt; mix well. Fill the shells with this mixture. Arrange in lightly oiled baking dish, cover with the marinara sauce
and the other 1/2 cup of Parmesan cheese. Bake for 25 to 30 minutes at 350 degrees.