Spray all the halves with avocado oil and sprinkle salt.
Place on a baking sheet and put in over for about 45 minutes.
While they are cooking make the filling. Cook the quinoa according to the package.
Brown the sausage and drain all the fat.
Dice the apple into small pieces.
Mix together quinoa, sausage, apple, and 2 tbsp of parmesan cheese.
Divide the mixture into 4 equal parts.
At the 45 minute mark check to see how tender the squash is. You want it to be almost fully tender with a little longer left to go. Fill each half with the stuffing and put back in the oven for about 10 minutes.
Remove and top each with 1/2 tbsp of parmesan cheese.