Place the frozen banana slices and the ice cubes into a high-speed blender. Adding the frozen elements first ensures the blades can break them down into a thick, slushy consistency before the liquids thin the mixture out.

Pour the cold brew coffee and the almond milk over the frozen fruit. Add the scoop of protein powder and the ground cinnamon on top. To prevent the protein powder from sticking to the sides of the blender jar, make sure it sits on top of the liquid rather than at the very bottom.

Secure the lid and blend on high speed for 45 to 60 seconds. You want to see a vortex form in the middle, which indicates the drink is becoming smooth and aerated. Continue blending until you no longer hear the sound of ice chunks hitting the blades.

Pour the mixture into a tall glass. If you want a “mocktail” feel, drizzle a little chocolate syrup around the inside of the glass before pouring. Garnish with an extra dash of cinnamon or a few banana slices and serve immediately with a straw.