upside-down cake

WordReference Random House Unabridged Dictionary of American English © 2025

up′side-down′ cake′, 

1. Food a cake that is baked on a layer of fruit, then turned before serving so that the fruit is on top.

• 1920–25, American.

Collins Concise English Dictionary © HarperCollins Publishers::

upside-down cake noun

1. a sponge cake baked with sliced fruit at the bottom, then inverted before serving