Whisk together until smooth:
1 1/2 cups confectioners sugar
5 tablespoons maple syrup
4 tablespoons unsalted butter, melted
1 tablespoon milk
Working one at a time spoon a generous tablespoon of icing on each cookie and spread to the edges using a small metal spatula or a butter knife. Hold the cookie level and gently shake to smooth out the icing. Set on a wire rack until the icing is dry.