Heat oven to 350°F. Grease ... (the surface of cake will be bumpy). Cool completely. Prepare chocolate pudding as directed on pkg. for ... on top of squares.
Follow directions on box for pudding; when thick, pour over cake mix. Beat 2 minutes. Pour ... pan. Sprinkle with chocolate chips. Bake at 350°F for 35 to 40 minutes.
Mix whipped topping, cream cheese, and pudding together. Pour mixture into piecrust and garnish with grated chocolate or chocolate pieces. Chill for 30 minutes and serve.