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

2. In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.

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

4. Add the eggs one at a time, then mix in the vanilla extract and cotton candy flavoring until smooth.

5. Gradually add the dry ingredients to the wet ingredients and mix until a soft dough forms.

6. Divide the dough evenly into two bowls. Tint one bowl pink and the other blue with gel food coloring.

7. Pinch small pieces from each dough color, press them gently together, and roll lightly into balls to create a swirled effect.

8. Place the dough balls on the prepared baking sheets and sprinkle with coarse sugar if using.

9. Chill the tray for 15 to 20 minutes so the cookies hold their shape.

10. Bake for 9 to 11 minutes, until the edges are set and the centers still look soft.

11. Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.