This is the 6523rd most frequent Polish word.
cukierniczej
"Of confectionery" or "confectionery-related."
Here, 'cukierniczej' is used as an adjective to describe the type of factory, specifically a confectionery factory.
Mój brat pracuje w cukierniczej fabryce.
My brother works in a confectionery factory.
In this instance, 'cukierniczej' modifies 'pasji' (passion), indicating a theme related to confectionery.
Kupiłem dekoracje do tortu w cukierniczej pasji.
I bought decorations for the cake in a confectionery passion.
Here, 'cukierniczej' describes 'sztuki' (art), suggesting that the course focused on artistic techniques related to confectionery.