Melt the chocolate chips in a double boiler or microwave. Be sure to not burn the chocolate. Once the chocolate starts to melt, remove from heat and stir until all the chocolate is melted. Set aside to cool to room temperature before making the icing.
Whip the butter for one minute. Add the icing sugar 1/2 cup at a time. Beat in the milk until well combined.
Pour in the cooled melted chocolate. Whip the icing for four minutes on high.