In a large baking dish or jelly roll pan, pour in around ¼-inch of boiling water.
Cut squash in half lengthwise and remove seeds and stringy pulp.
Place squash halves, cut sides down, in baking dish. Bake at 375ºF for 30 minutes.
Combine remaining ingredients.
Stuff center of each squash half with apple mixture.
Bake stuffing-side-up for 30 to 35 minutes or until apples and squash are tender.
Stir each squash center lightly before serving.