Don't have buttermilk on hand? Here are a few easy buttermilk substitutes!
In a medium-size bowl, whisk together the pudding mix, milk, buttermilk and vanilla until smooth. Let sit for 5 minutes until firm.
Crush two vanilla wafers into the bottom of each glass jar. Top the crushed wafers with two tablespoons of the pudding mixture and a few slices of banana. Crush two more cookies over the bananas then top that with two more tablespoons of the pudding mixture. Screw the lids onto the jars and place in the fridge for a few hours or overnight.