De or het amandelbroodje?

The correct Dutch article is:

het amandelbroodje

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

How to use amandelbroodje

the amandelbroodjehet amandelbroodje
this amandelbroodjedit amandelbroodje
that amandelbroodjedat amandelbroodje
our amandelbroodjeons amandelbroodje
your amandelbroodjejouw amandelbroodje
every amandelbroodjeelk amandelbroodje
which amandelbroodje?welk amandelbroodje?
a big amandelbroodje / the big amandelbroodjeeen groot amandelbroodje, het grote amandelbroodje