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, beat the softened butter, granulated sugar, and brown sugar with an electric mixer until light and fluffy.
04 - Add the eggs, vanilla extract, and cotton candy flavoring to the butter mixture. Beat until smooth and fully incorporated.
05 - Gradually mix the dry ingredients into the wet mixture until a soft, uniform dough forms.
06 - Divide the dough evenly into two bowls. Add a few drops of pink gel food coloring to one half and blue to the other. Mix each until the color is evenly distributed.
07 - Pinch off a small amount of dough from each colored half and gently press them together in your palms, swirling slightly to create a marbled effect. Roll into a 1 1/2-inch ball. Place on the prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 9 to 11 minutes, or until the cookies are set on the edges but still soft in the center.
09 - Let the cookies cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.
10 - Before serving, top each cooled cookie with a small tuft of cotton candy for a whimsical presentation. Add the cotton candy just before serving, as it dissolves quickly.