Final design i have decided to go with, ties in with poster effectively.
This two examples below are different ways in which I could make the little cardboard slip that will go over the cookie bag. As you can see i thought about maybe adding bite marks into the paper to emphasi the 'take a bite', i think the bite mark looks better in the corner though.
Having a bite mark in the corner would be quite tricky if i wanted to staple the pack together so I would have to think of something else to hold the card onto the plastic.
This simple design could work better than the bite mark idea because the wording that I have used is almost enough itself.