Gather all ingredients and measure them accurately.
Cream together softened butter, granulated sugar, and brown sugar until light and fluffy.
Add egg and vanilla extract, mixing until well combined.
In a separate bowl, whisk together almond flour, gluten-free all-purpose flour, baking soda, and salt.
Gradually add the dry mixture to the wet ingredients, stirring until just combined.
Divide the dough in half and shape each half into a log about 2 inches in diameter.
Wrap each log tightly in plastic wrap and refrigerate for at least 2 hours.
Preheat oven to 350°F. Slice the logs into 1/4-inch thick rounds and place on a baking sheet.
Bake for 10-12 minutes until edges are lightly golden. Let cool before transferring to a wire rack.