01 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together the gluten-free flour blend, baking powder, baking soda, and fine sea salt until evenly distributed.
03 - In a large bowl, beat the softened butter, granulated sugar, and lemon zest together using a hand mixer or stand mixer until light and fluffy, about 2–3 minutes.
04 - Add the egg, fresh lemon juice, and vanilla extract to the butter mixture. Beat until well combined and smooth.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until just combined. Avoid overmixing to keep the cookies tender.
06 - Gently fold in the shredded coconut and gluten-free crispy rice cereal until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized mounds of dough onto the prepared baking sheets, spacing them about 2 inches apart to allow for spreading.
08 - Bake for 10 to 12 minutes, until the edges are lightly golden and the centers appear just set.
09 - Allow the cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely before serving or storing.