If dates are dry, soak them in warm water for 5 to 10 minutes, then drain.

Add dates, banana, milk, oats, nut butter, cinnamon, and ice to a blender.

Blend on low speed, then increase speed until smooth and creamy.

Check consistency and add more milk if needed.

Taste and adjust sweetness by adding more dates if desired.

Blend briefly again if any adjustments are made.

Pour into glasses and serve immediately.