Start by zesting and juicing 8 key limes into a bowl, ensuring you capture their vibrant essence.

In a separate bowl, combine 2 cups of gluten-free flour, 1 teaspoon of baking powder, and 0.5 teaspoon of kosher salt; whisk until well combined.

Cream 0.5 cup of butter with 1 cup of sugar using an electric mixer for about 3-5 minutes until light and fluffy.

Mix in 0.5 cup of sweetened condensed milk, along with lime zest and juice until smooth.

Gradually fold the dry mixture into the wet ingredients until just combined, then fold in chopped graham crackers.

Cover and refrigerate dough for at least 1 hour.

Preheat your oven to 325°F (160°C); scoop, roll, and flatten dough into discs, rolling in key lime sugar.

Bake on a lined baking sheet for about 8 minutes until edges are lightly golden.

Cool on a rack, then drizzle with glaze and sprinkle graham cracker chunks before serving.