Prepare pasta according to package directions and rinse with cold water.
Put one cup of spaghetti sauce in the bottom of a 9x13 inch baking dish.
Mix egg, ricotta cheese, 1 3/4 cup of mozzarella cheese, basil, and parsley in a small bowl.
For easy stuffing, put the cheeses in a plastic baggie that seals and snip off a bottom corner.
Insert the cut corner into the manicotti and squeeze the bag to pipe the mixture into the shell. Be careful you don't overfill it or it may split.
Place the stuffed shells in the baking dish.
Pour the rest of the sauce over the shells and sprinkle with the last 1/4 of the mozzarella cheese.
Bake in a 350 F oven for about 30 minutes or until heated through and bubbly.