Peel the bananas and break them into your blender. Tip in the pumpkin seeds. Give the coconut milk tin a good shake to mix the contents well, then pour into the blender with a fragrant pinch of cinnamon.
Add 200ml cold water and a few ice cubes and blitz for 1-2 mins till the smoothie is combined. Pour into 2 glasses and sprinkle with a little more cinnamon to serve.
Extra thick shake
For a thicker, richer drink, leave out the water and just use the coconut milk. The drink will be creamier and is best served in short glasses with a few more ice cubes tumbled in.