I turn into a light particle and speed back to earth. I grab the cookie which shrinks (it is now microscopic, and fly around in space.

Teleports to you, steals the cookie, teleports back, then becomes a tree with no-breaking wood, and places it inside.

I set the tree on fire, turn into a spark, grab the cookie and float away. I then turn back to my normal self and run into the pokemon universe. I hide it in a pokeball and put the pokeball in the pokeball factory.

I was in the pokeball you stored the cookie in so i steal it and break free and, in Staravia form i fly away to Lumious.

You didn't know I was on your back as a bug, so once you landed, I jumped down, stole the cookie, and became a plant, with the cookie in my roots underground.

I hack into the GPS program that is tracking the cookie and follow you. I turn into a mole and dig and grab the cookie. I dig a really deep hole and put bug spray on (so you can't hitchhike as a bug) I cover the hole up behind me and hide there.

Edit: Late post

Turns into a lion and eats you, whilst breaking the ground and going into the wild into a group of 4,000 lions and then the micro-chip runs out of battery since it was a battery powered one :3

I climb up your throat with the cookie and take a bath in non-tox bleach so I don't start to dissolve. Turn into a flea, take the cookie and hide in the fur of dog in a dog shop filled with dogs.

Finds the dog and adopts it in human form, then walk home and takes the cookie, then hiding it in my fridge, which is stuffed and it is all the way back of it in a pile of millions of cookies :33