Combine flours, baking powder, baking soda, xanthan gum and cream of tarter in a mixing bowl and whisk to combine

In a large mixing bowl, beat butter and agave until fluffy. Add egg/flax mixture and extract and beat together. Add flour mixture and mix well, then stir in coconut. Shape dough into balls using a heaping teaspoon, flatten with a fork and bake 10-12 minutes until golden.

While cookies bake, cream ingredients for frosting together until smooth.

Remove from pan and cool on wire rack before frosting and eating them all at once.