also: はじっこ
I like the crust (end piece) of bread.
端 is the standard word for 'end' or 'edge' and is neutral in register. 端っこ is a colloquial, slightly childish or affectionate variant emphasizing a small or leftover end.
Derived from 端 (はし, 'end') with the diminutive suffix っこ, which adds a casual or affectionate tone. The alternate reading はじっこ comes from a voiced variant of the same root.