I don't have a recipe but it seems like a chocolate butter frosting and it probably has: lots of butter and/or margarine (and other emulsifiers?), lots of powdered sugar, a bit of unsweetened cocoa powder and milk. Top with chopped walnuts.
pinalafina, Thanks for that info. I was hoping someone had maybe replicated the exact recipe, I am not too good at making something without exact measurements. I wish I was just able to figure these things out for myself, maybe someday.