This is the 8632nd most frequent Turkish word.
reçelinizi
"Your jam" (possessive form).
In this sentence, 'reçelinizi' uses the possessive suffix '-iniz' to indicate something that belongs to 'you (plural or formal singular)', and carries the accusative suffix '-i' as the object of the verb 'eklemek' (to add).
Reçelinizi kahvaltıya eklemeyi unuttunuz.
You forgot to add your jam to the breakfast.
Here, 'reçelinizi' continues to carry the possessive and accusative structure indicating 'your jam' as the object of the question.
Reçelinizi neden bu kadar çok seviyorsunuz?
Why do you like your jam so much?
This example illustrates the same grammatical formation where 'reçelinizi' indicates a possessive form of 'jam' with 'you (plural)' as the owner and is in the accusative case emphasizing its role as the direct object of the verb 'görmek' (to see).