Preheat oven and prepare cake mix according to package directions.
Spray two 9-inch round pans with cooking spray then lightly flour.
Bake cake according to package directions; until golden brown and center passes the toothpick test. Once done, let cakes cool and invert on a wire rack to cool further.
For the Filling:
Beat 1 cup of milk and pudding mix with a whisk or mixer for 2 minutes. Gently fold in whipped cream. Let stand 5 minutes.
Place one cake on serving plate, spread pudding mixture on top, then top off with second cake.
For the glaze:
Microwave chocolate and butter on high for one minute in a small microwave safe bowl.
Stir until chocolate is melted.
Add powdered sugar and 4 tablespoons milk; mix well until smooth.
Spread over the top of the cake immediately letting drip down the sides.
Refrigerate at least one hour before serving.
