Preheat oven to 350 degrees F.
Spray a 9x 13 inch pan with non stick cooking spray, and set aside.
Wash zucchini and cut ends off
Bring a large pot of water to a boil, and add in zucchini.
Boil for 4-6 minutes until barely tender.
Drain water and remove zucchini to a cutting board.
Cut in half lengthwise, and arrange, cut side up in prepared baking dish.
Lightly salt the zucchini.
In a large bowl mix together cracker crumbs, cheese, and dried onions.
Sprinkle mixture evenly over zucchini.
Melt the butter, and pour over the zucchini and crumbs mixture.
Bake in preheated oven for 12 minutes or until lightly browned and zucchini is tender and cooked through.
Garnish with fresh parsley if desired.