Combine:
-Yellow cake mix
-2 c. warm water
-2 eggs
-1 (3 oz.) box instant chocolate pudding
Bake in a greased & floured cake pan at 350 degrees for 30 mins. Allow to cool completely before frosting.
Mix:
-1 TBSP. butter
-1 c. powdered sugar
-1 large egg yolk
Fold in an 8 oz. container of Cool Whip. Spread on cooled cake. Chop 2 or 3 Score (or Heath) candy bars (or 2/3 of a king-sized Symphony bar) & sprinkle on cake. Store in refrigerator.