Wash and cut squash and onion into small chunks. Cover and cook until tender in a 2 quart pot with water barely up to top of squash. Drain well.
Preheat oven to 400 degrees. Spray a 9x13 inch baking dish with nonstick cooking spray.
Crush crackers and beat eggs with a fork.
Return cooked squash to pot then stir in butter, sugar, salt, pepper, crushed crackers, and
Add beaten eggs and mix.
Spread into baking dish. Top with crumbs and butter.
Place in top half of oven and bake for 30 minutes.