Prep the banana: If you can, slice and freeze the banana at least 2 hours ahead.
Frozen banana gives the smoothie a creamy, frosty texture.
Soften the oats (optional): For extra smoothness, soak the oats in the milk for 10–15 minutes. If you’re in a rush, skip this step and blend longer.
Load the blender: Add milk first, then oats, banana, cocoa powder, yogurt or nut butter if using, sweetener, vanilla, and a pinch of salt.
Blend until silky: Start low, then increase speed. Blend for 45–60 seconds, or until completely smooth with no oat flecks.
Adjust to taste: Check sweetness and thickness.
Add a splash more milk if it’s too thick, or a small ice cube for extra chill.
Serve immediately: Pour into a glass and enjoy right away for the best texture.