If you're baking homemade Christmas cookies for gifting, and you want to use these mason jars as the packaging, you'll want to put the cookies in plastic treat bags before adding them to the mason jar. Mason jars are food safe, however, since you're working with artificial flake fake snow, you can transfer that from the snow globe portion from the top of the jar into the bottom of the jar. And that's not food safe. Also, if you're adding the fairy lights, that's not food safe either. So, you want to package your baked goods in a way without any cross contamination.