Pre-heat oven to 375 degrees and line baking sheets with parchment paper.
In the bowl of a stand mixer (or a large bowl with a hand mixer), cream together the butter and coconut sugar until light and fluffy, 3-4 minutes.
Add egg and vanilla and mix until combined.
In a separate medium bowl, whisk together flour, baking powder, baking soda and salt.
With mixer on low, gradually mix in the flour mixture until just combined (taking care not to over-mix).
Place remaining ¼ cup coconut sugar in a small bowl. Using your hands, form balls with about 1 ½ Tbsp of dough at a time. Roll balls in sugar and place on prepared baking sheets about 2 inches apart. Use a drinking glass or the palm of your hand to gently flatten the dough balls a bit.
Bake for 9-11 minutes until cookies are just turning golden on the bottom, but are still soft. Let cool on pan for a couple minutes before moving to wire racks to cool completely.