Add the onion and green apple and continue to cook for 4 minutes, until the onions and apple start to soften.
Add the kale. The kale will look like a lot but it will wilt down! Stir into the sausage mixture for 2 minutes.
Add the garlic, salt, pepper and Italian seasoning and cook for another minute.
This step is important. Measure the chicken stock into a measuring cup and then add the apple cider vinegar into the chicken stock and stir. Apple cider vinegar can really react with heat and can steam quite a bit – mixing it in with the chicken stock first will eliminate this. Add the mixture to the pan and stir. Allow to saute for an additional 5 minutes on medium heat.
Add the butternut squash noodles to the pan and toss. If the butternut squash noodles are a little more firm than you like, add a lid to the pan and steam the noodles for about 5 minutes on medium heat.
Plate up and serve with shaved parmesan cheese and red pepper flakes.