Add bananas to a food processor and process until broken up into little pieces. Add peanut butter and process again.
As mixture starts to come together, add the milk a splash at a time, allowing mixture to get more smooth between each addition.
Once the mixture is totally smooth, add a dash of cinnamon and process for another 10 – 15 seconds. Taste and add a dash of maple syrup if needed (only if your bananas aren't totally ripe).
Transfer milkshakes into two jars. Top with peanut butter and a little quinoa. Stir gently with a knife so you get that swirling effect.
* if your bananas aren't totally ripe, this may need a hint of sweetness. Add a dash of maple syrup if needed.** to cut down on calories, swap the coconut milk with unsweetened (or unsweetened vanilla) almond milk