Add zucchini, banana, protein powder, coconut milk, water, almond butter, maple syrup, cinnamon, and cocoa powder to a high-speed blender.
Blend until completely smooth and thick.
Add additional water or coconut milk if needed to reach desired consistency.
For a thicker malt-like texture, serve immediately.
For a drinkable smoothie consistency, add 1–2 additional tablespoons liquid.
Garnish with a light dusting of cocoa powder if desired.