Add all the ingredients to your blender, and blend until thoroughly mixed.
Depending on the strength of your blender, you may want to first blend the greens (roughly chop or tear any big pieces) with the milk. Then, add the remaining ingredients, in the order listed, blending as you go, so as not to overload a blender with a less powerful motor. I find that frozen bananas will get stuck in some blenders if there is not sufficient liquid. The add-as-you-go approach will help incorporate everything without having to add more liquid–important if you prefer a thick smoothie.
When adding any powdered ingredients like cinnamon or spirulina, stir them in a bit before blending so they don’t poof up and stick to the top of the blender.
Pour into a large glass or two smaller glasses and enjoy!