01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium mixing bowl, whisk together the gluten-free flour blend, baking powder, and salt.
03 - In a large bowl, beat the unsalted butter and granulated sugar until the mixture is light and fluffy. Add lemon zest and beat until aromatic.
04 - Beat in the egg, fresh lemon juice, and vanilla extract until thoroughly combined.
05 - Gradually mix the dry ingredients into the wet ingredients until just combined. Gently fold in the shredded coconut.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, leaving 2-inch spacing between each.
07 - Bake for 10 to 12 minutes, or until the edges are lightly golden. Allow cookies to cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.
08 - Whisk together powdered sugar and lemon juice in a small bowl until the glaze is smooth and slightly runny.
09 - Once cookies are cooled, drizzle the glaze over the tops. Allow the icing to set before serving.