Why yes, yes of course you can! You can either use this recipe for Cookies in a Jar as a guide and base and just change up the Christmas coloured smarties to suit any occasion. Some ideas: hershey kisses or cinnamon hearts for Valentine's Day, mini eggs or more chocolate for Easter, birthday sprinkles for birthdays, orange and black sprinkles for Halloween or green sprinkles for St. Patrick's Day. If you want to, you can switch up the recipe entirely and layer in the ingredients to make a batch of your favourite cookies! You might have to adjust the quantities a bit (probably half the original recipe) in order for it to fit in the jar.