Courtesy of AllHomemadeCookies.com

Chocolate Frosting for Cookies and Bars
by AllHomemadeCookies.com

1 1-ounce square chocolate

1 egg yolk, beaten

1 T. cream

Confectioner's sugar

Melt chocolate.  Blend egg yolk and cream into melted chocolate and add confectioner's sugar until a spreadable consistency.

Source: The Cookie Cookbook