Preheat oven to 350F. Slice squash in half lengthwise and clean out the seeds. Lightly brush with 1 Tbsp. olive oil and season with salt and pepper. Bake for 30-35 min. face down, until fork tender. Don't over cook so that the squash is falling apart.

While the squash is cooking, saute the apples and onion in the remaining 1 Tbsp. olive oil and season with salt and pepper. Continue cooking until the onions are transparent. Remove to a bowl and add the egg, bread crumbs and sausage.

When the squash are cooked fill them with the sausage mixture, pressing in slightly to fill well. Top with the Parmesan cheese and bake for another 20 min. until the cheese is melted.