Lightly coat a 9" x 13" baking dish with cooking spray and set aside.
Cook manicotti noodles according to the package instructions.
Combine Parmesan cheese, spinach, cottage cheese, ½ cup mozzarella cheese, egg white and garlic in a mixing bowl, mix well.
Scoop mixture into a gallon size Ziploc® bag and cut one corner off of the corner of the bag.
Spread ¾ cup of pasta sauce in the bottom of 9" x 13" baking dish.
Fill each manicotti noodle by squeezing approximately 1/4 cup of the spinach mixture into each noodle.
Place filled manicotti noodles into the baking dish.
After all the manicotti noodles are filled, top with the remainder of the pasta sauce.
Cover baking dish with foil and bake for 20 minutes.
Remove from oven and top with remaining 1/4 cup of shredded mozzarella cheese.
Set oven to broil and place oven rack into top position. Return manicotti to oven, placing baking dish on the top rack. Keep oven door cracked and broil for an additional 4 minutes, or until cheese is melted.