In KitchenAid Evergreen Design Series 6-Quart Ceramic Stockpot, cook macaroni noodles according to package instructions. Set aside.
In KitchenAid Evergreen Design Series 5-Quart Ceramic Saute Pan, cook bacon until crisp. Chop and set aside.
In same pan, add chopped onion and cook over low heat, stirring occasionally, until pieces are soft and lightly caramelized.
Add butternut squash cubes to onions along with 2 cups chicken broth. Cover and bring to boil. Reduce heat and cook until squash is soft and most liquid is reduced.
Pour squash and onions into bowl and add milk, remaining chicken broth, dry mustard, nutmeg and pinch of salt and pepper. Using KitchenAid Evergreen Design Series Tilt-Head Stand Mixer, puree mixture until smooth and creamy.
Pour pureed sauce into saute pan. Over low heat, add Parmesan cheese and 3/4 cup sharp cheddar cheese a little at a time, stirring constantly. Add noodles and stir well.
Add salt and pepper, to taste. Top with chopped bacon, remaining cheese and chopped parsley, if desired.