1 pkg. Duncan Hines Devil's food cake mix

Mix like directions on box only add 1/4 cup oil. Then grease 3 round 9 inch cake pans. Bake about 20 minutes.

FROSTING:

1/2 c. soft butter
2 c. powdered sugar
4 egg yolks
1 tsp. vanilla
6 crushed Heath bars, crushed with hammer
1/2 pt. whipping cream

Mix butter, sugar, egg yolks and vanilla. Add 1 egg at a time and cream very well. Fold in crushed Heath bars then fold in whipped cream, get stiff. Frost between layers and on top. Refrigerate without covering.