Prep your bananas. If you haven't already, peel and slice your bananas, then freeze them for at least 2 hours. Frozen bananas create that thick, creamy texture we're after.
Add liquid first. Pour your milk into the blender first. This helps everything blend more smoothly and prevents the blades from getting stuck.
Add the remaining ingredients. Toss in your frozen banana slices, peanut butter, Greek yogurt, honey, and vanilla extract.
Blend until smooth. Start on low speed and gradually increase to high. Blend for 30-60 seconds until everything is completely smooth and creamy.
Check the consistency. If it's too thick, add a splash more milk. If it's too thin, add a few ice cubes or more frozen banana.
Serve immediately. Pour into a glass and enjoy right away for the best taste and texture!