Martha Stewart's Macaroni and Cheese with Butternut Squash - VeryVera

Ingredients

• 1 small butternut squash (about 1 pound), peeled, seeded, and cut into 1-inch cubes (about 3 cups)
• 1 c homemade or low-sodium canned chicken stock, skimmed of fat
• 1 1/2 c nonfat milk
• ¼ tsp freshly grated nutmeg
• ⅛ tsp cayenne pepper
• 3/4 tsp. coarse salt
• Freshly ground black pepper
• 1/2 lb uncooked elbow macaroni
• 4 oz extra-sharp cheddar cheese, finely grated (about 1 cup)
• 4 tbsp. Parmesan cheese, finely grated (1 ounce)
• 2 tbsp. fine breadcrumbs
• Olive-oil, cooking spray
• 1/2 c part-skim ricotta cheese