When repeated, reply to “Who wants a cookie?” Crossword Clue

 Yes, "IDO" is a valid answer for the crossword clue "when repeated reply to who wants a cookie". It is a short and simple way of saying "I do". In this context, it would be an enthusiastic response to the question "who wants a cookie?".

Here are some other possible answers for the crossword clue:

YEP

SURE

FOR SURE

COUNT ME IN

I'M IN

I hope this helps! Let me know if you have any other questions.