In a blender, add the frozen wild blueberries, ripe banana, Greek yogurt, almond milk, almond butter, honey (if using), vanilla extract, and ground cinnamon.
Blend all the ingredients until smooth and creamy. If you prefer a thicker consistency, you can add a few ice cubes and blend again.
Taste the smoothie and adjust the sweetness by adding more honey if needed.
Pour the smoothie into a glass and enjoy immediately.