Place vanilla wafer cookies in the bottom of your favorite glassware. I like to use small mason jars, so one cookie fits perfectly in the bottom of each. If you prefer a larger dish, you may need 2-3 cookies for each layer.
Top cookie with a layer of vanilla yogurt (approximately 2 tablespoons per layer).
Add a layer of banana slices on top of the yogurt (I use 3 thin slices of banana per layer).
Repeat layers, starting with the cookies again.
Top with a dollop of whipped topping and drizzle with a small amount of caramel sauce, if desired.
Note: These are best if you allow them to sit in the refrigerator for a few hours so that the cookies soften and all of the ingredients come together!