Heat oven to 450°F. Bake 1 pie crust as directed on box for One-Crust Baked Shell, using 9-inch glass pie plate. Reduce oven temperature to 350°F. Unroll second pie crust on work surface; cut out shapes as desired. Bake cutouts on ungreased cookie sheet about 8 minutes or until light golden brown. Cool; set aside to decorate top of pie.
Put chopped chocolate in medium bowl; set aside. In small bowl, microwave whipping cream uncovered on High 30 seconds. Pour over chocolate in bowl. Stir until smooth. Reserve 2 tablespoons; set aside. To remaining chocolate mixture, stir in egg, 1/2 teaspoon vanilla and 1/8 teaspoon salt. Pour into baked shell. Bake at 350°F 10 minutes. Cool 15 minutes.
Meanwhile, in top of double boiler, mix sugar, flour and 1 teaspoon salt. In medium bowl, beat milk and egg yolks together with whisk or fork; beat into dry ingredients in top of double boiler. Cook over hot water 10 to 12 minutes, stirring constantly, until thickened. Stir in 1/2 teaspoon vanilla. Pour onto chocolate layer; refrigerate 4 hours. Just before serving, arrange pound cake pieces over pie. Drizzle reserved chocolate mixture over pie. Top with crust cutouts. Cover and refrigerate any remaining pie.