In a large mixing bowl, add the all the Ricotta, Mozzarella, and 1/2 cup Parmesan cheese, eggs, parsley, salt and pepper. Mix together.
Preheat your oven to 180 C (350 F) and get out a 9x13 baking dish. Add 1 cup of spaghetti sauce to the bottom of the baking dish and make sure it is spread out.
Using either a piping bag with a nozzle that will fit inside the end of a manacotti shell, or a small spoon that will fit inside (this is the method I used), pipe the cheese filling into a dry manicotti shell or fill with a small spoon, and place that into the baking dish. Continue to fill shells and arrange in the baking dish.
Top with remaining spaghetti sauce and sprinkle on the remaining Parmesan cheese.
As a Variant, sprinkle with some shredded Mozzarella cheese then top with slices of Provolone cheese (recommended and is the method I used).
Cover with foil and bake for 45 minutes. Remove foil and bake for 15 minutes more.
Serve and enjoy.