01 -
Heat the oven to 325°F (160°C). Line two baking trays with parchment.
02 -
Blend salt, sugar, and flour in a food processor until well-mixed.
03 -
Add some butter chunks and give it a few pulses. Then toss in the rest, pulsing until it starts forming dough.
04 -
Split the dough into 4 bowls. Mix each one with a different gel color until smooth and even.
05 -
On some plastic wrap, arrange the colored dough pieces in rows next to each other, starting with the lightest color and going darker. Roll into a log shape and trim one end to clean it up.
06 -
Slide the dough log into a piping bag with a star tip attached.
07 -
Pipe cookie spirals onto your prepared baking trays, spacing them out a little so they don’t touch during baking.
08 -
Put the trays in the oven and bake for 25 minutes. Switch tray positions halfway through. Cookies should stay pale but firm.
09 -
Shift baked cookies to a rack and let them cool down completely before adding decorations.
10 -
Microwave the white chocolate in a bowl, stirring every 10 seconds until it’s melted and silky.
11 -
Dip one end of each cookie in the melted chocolate, then cover with rainbow sprinkles while still wet.
12 -
Put the sprinkles-covered cookies on parchment paper. Let the chocolate completely harden before serving or packing them up.