Preheat the Oven:

• Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone mat.

Mix the Dry Ingredients:

• In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.

Cream the Butter and Sugar:

• In a large bowl, cream together the softened butter and granulated sugar using an electric mixer until light and fluffy, about 2-3 minutes.

Add Wet Ingredients:

• Add the egg, vanilla extract, and buttermilk (or milk mixture) to the butter and sugar mixture. Beat until well combined.

Combine Wet and Dry Ingredients:

• Gradually add the dry ingredients to the wet ingredients and mix until just combined. The dough will be soft and slightly sticky.

Add the Color:

• Divide the dough into two portions. Add a few drops of pink gel food coloring to one portion and blue gel food coloring to the other. Mix each portion until the colors are vibrant and fully incorporated.

Form the Cookies:

• Use a spoon or cookie scoop to form small balls of dough, one from each color. Gently press the two dough balls together to create a marbled effect. Place them on the prepared baking sheet, spaced about 2 inches apart.

Bake:

• Bake the cookies for 8-10 minutes, or until the edges are lightly golden but the centers are still soft.

Cool:

• Let the cookies cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Optional: Add Cotton Candy Flavoring:

• If using cotton candy flavoring, add a few drops to the dough while mixing in the wet ingredients. Adjust to taste.