YOU SAID:
Cookie, what have you put things?
INTO JAPANESE
クッキー、何を入れたの?
BACK INTO ENGLISH
What did you put in the cookies?
INTO JAPANESE
クッキーには何を入れましたか?
BACK INTO ENGLISH
What did you put in the cookie?
INTO JAPANESE
クッキーに何を入れましたか?
BACK INTO ENGLISH
What did you put in the cookie?
That didn't even make that much sense in English.