Everyone likes cookies, no matter how evil you are. I bet Vader eats cookies when he is in that room where he can take his mask off. Yoda would certainly eat cookies sitting in his tiny house in the Dagobah swamp. If you want to make your own Star Wars cookies, check out these Rebel Friends Cookie Cutters.
You get six cookie cutters in the set including Luke, Leia, Yoda, Chewie, C-3PO, and R2-D2. Their Chibi-style faces are all rudimentary enough that they should maintain their details after baking.
The set comes with all six cutters for $19.99(USD) and they are available at ThinkGeek right now. Now I want cookies.