Preheat Oven: Set your oven to 350°F (175°C) and prepare your baking sheet with parchment paper.

Mix Dry Ingredients: In a medium bowl, combine the flour, baking powder, baking soda, and salt. Whisk them together.

Cream Butter and Sugar: In a large bowl, beat the unsalted butter and granulated sugar together until light and fluffy, about 2-3 minutes.

Add Wet Ingredients: Incorporate the egg, vanilla extract, and buttermilk into the butter-sugar mixture. Blend until smooth.

Combine Mixtures: Carefully mix the dry ingredients into the wet mixture until just combined.

Color the Dough: Divide the dough into two equal parts. Add pink gel coloring to one half and blue to the other.

Form Cookies: Roll small balls of both colored dough together and place them on your prepared baking sheet.

Bake: Cook your cookies in the preheated oven for 10-12 minutes, until edges are lightly golden.

Cool and Serve: Allow cookies to cool on the baking sheet for a few minutes, then transfer to a wire rack.