Dice butter into ½" square pieces, leave them on the cutting board to come to room temperature. In a large bowl whisk together the flour and icing sugar.
Add the room temperature butter tossing in the flour until covered.
Squeeze the butter between the tips of your fingers and thumb working it into the flour and sugar.
Once the pieces of butter are smaller you can use two knives to cut the butter until most of the mixture is fine crumbs. Stir in coconut.
Pour the mixture into an 8” by 8” square pan lined with parchment paper. Spread the crumbs until they evenly coat the bottom of the pan.
Use an offset spatula, the bottom of a measuring cup or your hand to gently pat the crumbs down.
Bake in a 350°F oven for 25 minutes until golden. Allow to cool slightly on a cooling rack.