Butter 9x13 pan. Cut angel food cake into pieces, put pieces in pan.
Chop 4 Butterfinger candy bars and 1/2 cup pecans. Mix together and set aside.
Cream 1/2 cup butter; mix in 2 cups powdered sugar, 2 tbsp vanilla, and 4 well-beaten egg yolks. Fold in one pint of cream whipped.
Pour 1/2 creamed mixture over angel food pieces. Then sprinkle 1/2 Candy and nut mixture. Repeat both.