Butterfinger Dessert

1 angel food cake
2 tsp. vanilla
4 egg yolks
2 cups powdered sugar
1 small cool whip (whipped cream)
¼  cup butter
3 butterfinger candy bars

Crumble cake in pan.  Mix vanilla, yolks, and butter.  Then add powdered sugar.  Then fold in cool whip.  Crumble candy bars over top and then refrigerate.