You’ll need a 6cm/2½in round cookie cutter (smooth ... snowflake, angel, star – though you could always use the sharp end of a piping nozzle to make a small hole. I do feel the investment ...

Geologist Katy Atakturk was just trying to make marbled sugar cookies when she took out her angel cookie cutter and realized, in her own words, "conforming to the norm wasn't going to cut it.