1 to 1 1/2 ripe bananas, depending on size and ripeness. You should not be able to taste any green.
2-3 scoops of low fat or fat free vanilla frozen yogurt. We prefer Kroger frozen yogurt.
1 percent milk - as much as you want. Banana milkshakes tend to be runny, so a little milk will do it.
Put it in the blender (we use a Nutri bullet) and blend.
It's "Peter Rabbit simple" as a former boss used to say - but a lot of my best recipes are.