I've got the perfect recipe for filling a 502. Homemade Cheez-Its.
I can't guarantee that it will remain full for long. These are amazing! You can find the super simple recipe HERE. My tips for this recipe are to roll them thin, make sure to get them down to 1/8". You don't need a cookie cutter you can use a knife to cute the squares and instead of Kosher salt I used sea salt and sprinkled some on the top of the crackers as well.