Pumpkin Rigatoni with Chicken

Ingredients

• 3 cups dry rigatoni noodles
• 1 teaspoon olive oil
• 1 small yellow onion, finely chopped
• 3 garlic cloves, minced
• ¼ teaspoon ground cinnamon
• ¼ teaspoon nutmeg
• 2 cups chicken stock
• 1 ¾ cups homemade pumpkin purée (see additional recipe)
• 1 tablespoon chopped fresh sage
• ⅛ teaspoon ground black pepper
• 1 ⅓ cups chopped rotisserie chicken breast meat
• 2 cups loosely packed torn baby spinach
• 2 tablespoons grated Parmesan cheese plus additional for garnish (optional)