The day before, pour the whole milk into ice cube trays and freeze completely solid.

Chill your blender pitcher in the freezer for 15 minutes before starting.

Make the Blue Half: Add half of the frozen milk cubes, half the heavy cream, half the condensed milk, half the salt, the cotton candy extract, and blue gel color to the blender.

Blend on high, stopping frequently to scrape down the sides, until thick and perfectly smooth. Transfer to a bowl and place in the freezer.

Clean and dry the blender. Make the Pink Half: Add remaining milk cubes, heavy cream, condensed milk, salt, bubblegum extract, and pink gel color. Blend until smooth.

Transfer the pink mixture to a bowl. Let both bowls sit in the freezer for 15-20 minutes to firm up to piping consistency.

Fit a piping bag with a large star tip. Spoon the blue mixture down one half of the bag, and the pink mixture down the other.

Pipe in an upward swirling motion into cups and serve immediately.