Preheat oven to 350 and coat 9x13 pan with cooking spray.

Cook manicotti shells according to directions, drain, rinse, and drain again.

In a large bowl, combine ricotta cheese, one cup of mozzarella, the Parmesan cheese, egg, salt, pepper. Then add broccoli and mix well.

Pipe each shell with one third of a cup of the mixture and place in baking dish. Pour spaghetti sauce over them and sprinkle the rest of the mozzarella on top.

Bake 35-49 minutes or until hot and bubbling.