Butternut Squash Mac and Cheese

Ingredients

• 1 small butternut squash (about 1 pound), peeled, seeded, and diced (about 3 cups)
• 1 cup low-sodium vegetable broth
• 1 1/2 cups skim milk
• Pinch of nutmeg
• Pinch of cayenne pepper
• 3/4 teaspoon salt
• Freshly ground black pepper
• 1 pound whole wheat spirals
• 1 cup shredded extra-sharp cheddar cheese
• 4 tablespoons Parmesan cheese, grated
• 1/2 cup part-skim ricotta cheese
• 2 tablespoons breadcrumbs
• 1 teaspoon olive oil
• Olive-oil cooking spray, for baking pan