01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, use an electric mixer to cream the softened butter, granulated sugar, and brown sugar until light and fluffy.
04 - Add the eggs, vanilla extract, and cotton candy flavoring to the butter mixture; beat until smooth and well combined.
05 - Gradually mix the dry ingredients into the wet mixture until a soft, uniform dough forms.
06 - Divide the dough evenly into two bowls. Tint one half with a few drops of pink gel food coloring and the other half with blue gel food coloring; mix each until the color is evenly distributed.
07 - Take a small portion from each colored dough and gently roll together in your hands to form a 1.5-inch ball with a marbled effect. Place on the prepared baking sheets, spacing them 2 inches apart.
08 - Bake for 9 to 11 minutes or until the cookies are set but still soft in the center.
09 - Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
10 - If desired, top each cooled cookie with a small tuft of cotton candy just before serving for a whimsical finish.