Uses the universal remote from Click (the movie) and rewind the cookie to the state in which it was baked (warm and crispy!). I put the cookie in a space pod and shoot it into a black hole, not knowing where it goes, or if it survives.
I go ninja on that 60-year old outdated virgin cowboy and he dies with 1 punch. I hide the cookie in a diferent dimension exactly like naruto. . .lolz.
I dig under the walls and up into the fort, using Harry Potter's invisibility cloak to sneak in and steal the cookie. I Wrap it in the invisibility cloak and give it to superman, who goes back in time and puts the cookie on his home planet of Krypton, after saying high to his mom and dad, and guards the cookie.
I go back in time to when I gave the cookie to Superman and replace it with a Crablice-covered cookie. I go back to Earth and go to the pyramid under the ice in antarctica from Alien Vs. Predator1, and put the cookie in the room with the face huggers and rig the door to close without opening again after I leave, so whoever tries to steal the cookie gets Alien eggs in their stomach. I leave and go to my house to sip hot cocoa.
I slice open your stomach, take the cookie out, clean it, and get into a large tank that can dig down into the earth. I encase the cookie in unmeltable steel and dig into the core of the earth and eject the cookie into it. I go back to the surface and put milk into a cup and drink it.