Peel the bananas. For a thicker, colder smoothie, slice and freeze the bananas for 10 minutes.
Add milk, Greek yogurt, peanut butter, bananas, honey, vanilla, cinnamon, salt, and ice to a blender.
Blend on high until completely smooth and creamy, 30 to 60 seconds.
Taste and adjust: add more honey for sweetness, more milk to thin, or more ice to thicken.
Pour into 2 glasses and serve immediately. Garnish with a pinch of cinnamon or crushed peanuts if desired.
Notes
For dairy-free, use almond milk and skip the yogurt or substitute dairy-free yogurt. For extra protein, add a scoop of vanilla protein powder and a splash more milk if needed.