Pumpkin Mac and Cheese

Name: Pumpkin Mac and Cheese
Ingredients: 2 cups dried elbow macaroni (8 ounces); 2 tablespoons butter; 2 tablespoons all-purpose flour; 1/2 teaspoon salt; 1/2 teaspoon ground black pepper; 1 cup whipping cream; 1 cup whole milk; 4 ounces Fontina cheese, shredded (1 cup); 1 15 ounce can pumpkin; 1 tablespoon snipped fresh sage or 1/2 teaspoon dried leaf sage, crushed; 1/2 cup soft bread crumbs; 1/2 cup grated Parmesan cheese; 1/3 cup chopped walnuts; 1 tablespoon olive oil; Sage leaves (optional)