Preheat oven to 350F.  Spread 3/4 cup of the spaghetti sauce on the bottom of 13×9-inch baking dish.  Mix egg, cheese and pesto until well blended.  Spoon cheese mixture into large resealable plastic bag.  Using scissors, cut off small hole from one of the bottom corners of the bag.

Fill manicotti shells, one at a time, squeezing cheese mixture into both sides of each shell.  Place manicotti over sauce in baking dish; pour remaining  1 3/4cups spaghetti sauce over manicotti.  Cover with foil.

Bake 40 min. or until heated through.