Cut the acorn squash and scrape out the seeds from the center cavity.
Drizzle with olive oil and sprinkle with salt.
Roast the squash in the oven at 400F for 45 minutes or until fork tender.
While the squash is roasting, heat the olive oil in a large pan and add the onion, salt, pepper, rosemary, until the onions begin to lightly brown and soften.
Add the garlic and the sausage and cook until sausage is browned.
Add the apple and cook until softened.
Add the sage.
Mix in the cheese and breadcrumbs (reserving just a bit to sprinkle on top of squashes) until evenly mixed through.
Remove the squash from the oven and fill with stuffing.
Add reserved Panko topping and return to oven for 15-20 minutes until topping is slightly browned.