I use a portal gun to send the pressurised box to the surface and break it open to get the cookie. I create an alternate dimension and place the cookie in maximum security. Next I close the portal and make it so that the alternate dimension can only be accessed by me.
I ask you why the heck you care so much about one cookie. Then I make more. Then I hack reality, punch through to your dimension, and then divide the last digit of pi by 0, causing the guards to die in a fire that leaves the cookie untouched. I hacked reality using the cookie, which i promptly time travel back and give myself so I can avoid destroying all of space time with a paradox.