Chocolate Cream Pie

Name: Chocolate Cream Pie
Ingredients: 16 tbsp. unsalted butter, cut into 1/2″ cubes and chilled, plus more for pie plate; 1⁄4 cup packed light brown sugar; 1 (9-oz.) package chocolate wafers, such as Nabisco, finely ground (about 2 1/4 cups); 3 1⁄2 cups half-and-half; 2⁄3 cup plus 2 tbsp. sugar; 1⁄4 cup cornstarch; 9 egg yolks; 9 oz. semisweet chocolate, finely chopped; 2 oz. unsweetened chocolate, finely chopped; 2 1⁄2 tsp. vanilla extract; 2 cups heavy cream; dark chocolate, for garnish