Peanut Butter Nanaimo Bars

Name: Peanut Butter Nanaimo Bars
Cuisine: American
Ingredients: 1/2 cup butter; 1/4 cup sugar; 1 egg, beaten; 1/4 cup cocoa; 1 1/2 cup graham wafer crumbs; 1/4 cup coconut; 1/2 cup unsalted peanuts, finely chopped; 1/2 cup smooth or crunchy peanut butter (try natural peanut butter, for all the peanut-y taste without adding more sweetness); 2 cups icing (confectioners) sugar; 1/4 cup milk; 2 tablespoons butter; 1/2 tsp. vanilla; 4 ounces (squares) semi sweet chocolate