Add your bananas, peanut butter, and non-dairy milk to the blender and blend until thick, creamy and smooth. Start out with less milk to ensure you achieve a thick texture. Then add more to ensure that it all blends evenly.
Once blended, drop in two no-bake cookie bites and give it two more pulses to loosely mix.
Pour into serving glasses, and top with another crumbled no-bake cookie bite (optional). Serve immediately.