Cut the zucchini into 0.5 inch thick slices. Put the egg whites and breadcrumbs in separate bowls. Preheat the oven to 400 degrees.

Dip the zucchini pieces into the egg white and then cover with the breadcrumbs. Place on a baking sheet and bake for 25-30 minutes, carefully flipping once towards the end. Remove from the oven when browned and firm.

While the zucchini are baking, cook the pasta according to package directions. Drain and mix together with 2 cups sauce and 0.5 cup cheese. Pour into a greased 9x13 baking dish.

Arrange the baked zucchini pieces over the top, cover with remaining 1 cup sauce and 0.25 cup cheese. Bake for 10 minutes or until cheese is melting and everything is hot and bubbling. Sprinkle with parsley.