In a large mixing bowl, whisk in the cooled melted butter with the granulated until well combined. Whisk in the egg and vanilla extract until smooth and well combined.Stir the dry ingredients into the wet until just combined.
Gently pry the cookies off the hot waffle iron using a silicone knife or flexible spatula. Transfer the cookies to a cooling rack to cool to room temperature. Dust with powdered sugar or top with your preferred topping and enjoy!