De or het kuchtje?

The correct Dutch article is:

het kuchtje

Rule Diminutives (-je, -tje, -pje): always het. See the rule

This word is not in the word lists we use to double-check answers.

How to use kuchtje

the kuchtjehet kuchtje
this kuchtjedit kuchtje
that kuchtjedat kuchtje
our kuchtjeons kuchtje
your kuchtjejouw kuchtje
every kuchtjeelk kuchtje
which kuchtje?welk kuchtje?
a big kuchtje / the big kuchtjeeen groot kuchtje, het grote kuchtje