In a large mixing bowl, whisk together the Greek yogurt, vanilla protein powder, milk, vanilla extract, and dry pudding mix until the texture is completely smooth.
Let the mixture rest for 5 minutes to allow the pudding mix to hydrate and thicken.
Prepare four individual serving containers or one medium glass dish.
Place a layer of vanilla wafers at the bottom of the containers, followed by a layer of sliced bananas.
Spoon a portion of the protein pudding mixture over the banana layer, smoothing it with a spatula.
Repeat the layering process once more, ending with a layer of pudding.
Crush the remaining wafers and sprinkle them over the top for texture.
Cover and refrigerate for at least 1 hour to allow the wafers to soften and flavors to meld before serving.