Aunt Fanny's Cabin Squash

Source: Aunt Fanny's Cabin - Atlanta, Georgia

3 pounds summer squash
1/2 cup chopped onion
1/2 cup bread crumbs
2 eggs
1/2 cup (1 stick) margarine
1 tablespoon granulated sugar
1 teaspoon salt
1/2 teaspoon pepper

Cook squash and mash all ingredients together except 1/2 of the melted margarine. Top with crumbs and butter. Bake in a casserole dish for 1 hour at 375 degrees F.