In a small saucepan over medium heat, whisk the butter and maple syrup together until the butter is completely melted and is combined with the syrup. Remove from the heat and whisk in the confectioners’ sugar and salt. Let cool for 15 minutes.☞ TESTER TIP: If your glaze is runny set a baking sheet under the cooling rack to catch any drips when you drizzle the glaze over.