What ingredient is NOT used to craft a cake in Minecraft?

The ingredient that is not used to craft a cake in Minecraft is bread. While bread is a common food item that players can craft using wheat, it is not necessary for crafting a cake. Instead, a cake in Minecraft is made by combining milk buckets, sugar, wheat, and eggs. Bread is not part of the recipe for crafting a cake, hence it is not used in the process.