01 - Preheat oven to 350°F (175°C). Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together the gluten-free flour blend, baking soda, and salt until evenly distributed. Set aside.
03 - In a large bowl, beat the softened butter and granulated sugar with a hand mixer on medium speed until light and creamy, approximately 2 minutes.
04 - Add the egg, freshly squeezed lemon juice, lemon zest, 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.
06 - Gently fold in the shredded coconut and white chocolate chips (if using) until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them approximately 2 inches apart. Flatten each dough ball gently with the back of a spoon or your palm.
08 - Bake for 12–15 minutes, until the edges are golden brown. Allow cookies to rest on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.