Protip for smoothies: Green bananas are high in resistant starch so the amount of carbs you actually absorb is about half of a ripe banana, which works great if you are low carb as well. They are easiest to peel by pinching the "wrong" end, and you can break them into quarters and freeze them so they are ready to go whenever you want.
Goes great with dutched cocoa powder and instant coffee powder.
Also great with Ceylon cinnamon with a tiny bit of nutmeg and clove. Note that "regular" cinnamon is also known as saigon/fake cinnamon, and is toxic to the liver in large quantities (which is why the EU has regulations on "cinnamon" buns). My favorite ceylon cinnamon is here as it actually has a strong taste unlike most ceylon offerings I've found.
For sweetener I use lakanto monk fruit drops. A ripe banana in a smoothie doesn't need any sweetener, but green bananas could use some help.
For those that don’t already know, unlabeled plain “cinnamon” is cassia cinnamon, which contains high levels of coumarin that can build up and can eventually fuck your liver. It’s not a concern if you rarely have it, but for those that pound it down it will be an issue. This is why there are sensationalist headlines of things like the EU regulating cinnamon rolls, they are trying to prevent toxic exposure to coumarin.
Ceylon cinnamon on the other hand has orders of magnitude less coumarin. If you commonly eat cinnamon, get this kind. The taste/smell is often much milder/fruitier (sometimes disappointingly so) due to the generally lower cinnamaldehyde levels, but there are stronger varieties out there. I’m fond of this one