Any simple cookie, quick bread or muffin recipe that can be mixed in two simple steps work the best. 1. Adding the wet ingredients to the dry ingredients. 2. Mix to combine. Also, try to keep the wet ingredients at a minimum (2-4 ingredients) since those are the ingredients your gift recipient will need to have on hand. More complex recipes where sugar needs to first be beaten with eggs are more complicated to give as gifts but can work with more detailed instructions and additional ingredients provided by the person receiving your cookie mix in a jar. When choosing a recipe, consider the person receiving the gift and how much effort they are likely to put into preparing your cookie mix in a jar gift.