Chicken Spinach and Pasta Al Forno

Name: Chicken, Spinach and Pasta Al Forno
Ingredients: 1 pound spinach; 1/2 pound dried short pasta, such as mezze rigatoni or penne; 1 1/4 cups heavy cream; 1 crushed garlic clove; 1/2 teaspoon kosher salt; Fresh ground black pepper, to taste; 1 cup cooked chicken, in bite-size pieces; 1/3 cup shredded Fontina cheese; 1/3 cup grated Parmesan cheese; 2 tablespoons butter