This is the 12373rd most frequent Turkish word.
hazırlamayı
"Preparing" or "to prepare."
In this sentence, 'hazırlamayı' is a noun form derived from the verb 'hazırlamak' (to prepare), modified to indicate the act of preparing food as an object of the verb 'seviyorum' (I like/love).
Yemek hazırlamayı çok seviyorum.
I really enjoy preparing food.
Here, 'hazırlamayı' is used as an object of the verb 'unuttum' (I forgot), specifically referring to the act of preparing homework.
Ödevimi hazırlamayı unuttum.
I forgot to prepare my homework.
In this sentence, 'hazırlamayı' is the focus of the verb 'düşünüyorum' (I am considering), referring to the act of creating a presentation.