1. Preheat the oven to 350°F and line two baking sheets with parchment paper.

2. In a large mixing bowl, beat the softened butter and granulated sugar until light and fluffy.

3. Add the egg, vanilla extract, and cotton candy extract, then mix until smooth.

4. Stir in the flour, baking powder, and salt until a soft dough forms.

5. Divide the dough evenly into three bowls and tint one pink, one blue, and one yellow.

6. Pinch small pieces from each colored dough, press them together, and gently roll into balls to create a swirled look.

7. Roll each dough ball in coarse sanding sugar.

8. Place the cookies on the prepared baking sheets, leaving space between each one.

9. Bake for 10 to 12 minutes, or until the edges are set and the centers still look soft.

10. Cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.