Preheat the oven to 400º. Line a baking sheet and place the squash halves cut side up on the baking sheet. In a small dish, combine the melted butter and minced garlic. Brush the butter mixture onto the inside and outside of each squash half. Roast in the oven for 50-60 minutes until tender.

Alternately, place the squash halves in the microwave and cover with plastic wrap; cook for 5 minutes, or until almost cooked completely.

In a large skillet over medium heat add the sausage. Cook, breaking up with a spoon, until meat is cooked through. Remove meat to a mixing bowl and place the skillet back on the burner. Add a little olive oil and then add the onion, celery and mushrooms to the skillet and cook for about 3 minutes. Add the apples and cook for an additional 2 minutes.

Add the onion mixture to the sausage in a bowl. Add panko crumbs and cheese. Season with salt & pepper to taste. Add the egg white and stir until well combined.

Evenly pile the sausage stuffing into the two cooked halves. Return to the oven and cook for an additional 18-20 minutes.