Preheat your oven to 175 degrees Celcius.
Mix sugar, egg and butter in a bowl.
Mix baking powder, salt and flour in another bowl, before you mix it all together.
Separate the dough into 4, and put each dough in a bowl.
Mix the colour and the dough.
Separate the coloured doughs into 15 blobs.
Make a "snake" of every blob.
Put 4 "snakes" together, one of each colour.
Make the four-coloured "snakes" longer by rolling them carefully.
I think a length of 15 cm would be good.
And now for the tricky part.
Have your roasting tray ready.
Twist the "snake" while your making a spiral of it on your roasting tray.
It might take a little practice. :-)
Make spirals of all 15 "snakes".
Bake the cookies for 10-12 minutes.
And DONE ... Ready to eat!
... And that is how the cookie crumbles. :)