a piece of cake

:  a part of a whole: such as

:  fragment

:  portion, allocation

:  to repair, renew, or complete by adding pieces :  patch

:  a breadlike food made from a dough or batter that is usually fried or baked in small flat shapes and is often unleavened

:  a sweet baked food made from a dough or thick batter usually containing flour and sugar and often shortening, eggs, and a raising agent (such as baking powder)

:  a flattened usually round mass of food that is baked or fried

:  encrust

:  to fill (a space) with a packed mass

:  to form or harden into a mass