Shells with Crispy Pancetta and Spinach

Name: Shells with Crispy Pancetta and Spinach
Ingredients: 1 (12-ounce) package jumbo shells pasta; 2 tablespoons olive oil; 1/2 pound thick-cut pancetta, cut into 3/4-inch cubes; 2 pounds frozen spinach, thawed and drained; 1 (15-ounce) container whole milk ricotta; 1 cup grated asiago cheese; 1/2 teaspoon freshly ground black pepper; 1/4 teaspoon freshly grated nutmeg; 1 tablespoon butter; 1 garlic clove, minced; 1 cup cream; 2 cups grated asiago cheese, plus 1/4 cup; 1/4 cup chopped fresh parsley; 1/4 teaspoon freshly ground black pepper