Heat a medium sized pot over medium heat, and add butter.
Season the chicken with garlic powder, onion powder, salt, and Italian seasoning on both sides. Add to the pan, and sear on each side until it is cooked through. Remove the chicken from the pan and set to the side.
Add the onion, garlic, celery, and carrot to the food processor and chop until it is very fine. Add to the pan, and saute for 2 minutes. Add the finely chopped fresh herbs and stir to incorporate.
Add the pumpkin puree and the crushed tomatoes. Add the nutmeg, red pepper flakes, salt, and pepper. Stir and bring to a simmer. Add the heavy whipping cream, and let cook for a few more minutes to allow the flavors to marry.
Cook your favorite pasta according to package directions, and serve with this delicious pumpkin pasta sauce on top and Italian chicken. Mangia!
Nutrition values are estimates, for exact values consult a nutritionist.