Here is the recipe for the frosting for the chocolate drop cookies.

2 squares unsweetened chocolate
2 Tablespoons margarine or butter
3 Tablespoons water
About 2 cups powdered sugar

Heat the chocolate and margarine over low heat until melted. Take off the heat. Stir in water and powdered sugar until smooth and spreadable.
Frost the cookies.
If you have cocoa powder, but not chocolate squares you can substitute. You will need 6 Tablespoons of cocoa powder and 2 Tablespoons of shortening or cooking oil.