What would your character do for a cookie? Will they commit murder, lie, steal, start a fake romance or just ask? Or any of the millions of other possibilities. The choice is yours.
Do they commit the biggest sin on Earth and NOT LIKE COOKIES?!?! Will your character do nothing or everything for a cookie? How dedicated are they to cookies? What kind of cookies do they like of hate? Does it start raining cookies? Or is there is a global cookie shortage?
There are basically no parameters or boundaries to this contest, write what you want about cookies. You can use 1st, 2nd or 3rd person. Your character could be a captain at sea deprived of cookies or a greedy overlord hogging all the cookies or anything your heart desires. Use your imagination.