Teacake

A teacake was a kind of cake. Kate Yates once purchased a teacake from a tea shop in Winchelham. (PROSE: I Am A Dalek)

Nardole claimed to the Twelfth Doctor that he was the only one in the TARDIS who knews were the tea cakes were. (TV: The Eaters of Light)

Behind the scenes
Teacakes are named such because they were typically served with tea.