If you are using whole dates rather than date nectar and they are not soft and sticky then place them in a small bowl and cover with boiling water, leave to soak for 10 minutes then drain.
Place the oats in a blender and blitz until they are finely ground.
Add the date nectar/dates, banana, milk, cacao powder, peanut butter and ice to the blender and blend until smooth.
(Optional) Drizzle the inside of a glass with a little chocolate sauce, pour in the smoothie and serve, OR pour the smoothie into a travel cup with a straw and drink on the go.