2 tbsp cocoa powder
2 tbsp peanut butter
8 oz Greek yogurt
1/2 cup ice
1 banana
pinch cinnamon

Pour peanut butter, cocoa powder, Greek yogurt and ice cubes into blender and mix at high speed. Slice banana, add into mixture, and re-blend. Pour smoothie into two cups and serve. Sprinkle dash of cinnamon on top for extra flavor.