Gather your blender, spatula, and a serving bowl to start.
Place the ripe banana and mixed berries into the blender.
Add the peanut butter and pour in the milk.
Blend everything on high for about 30 seconds, until the mixture is thick, smooth, and creamy. You should hear a gentle whirring, and the mixture should be uniform without lumps.
Check the consistency; it should be spoonable and thick. If it's too runny, add a few more frozen berries and blend again for a few seconds.
Use a spatula to scoop the thick smoothie into your serving bowl, smoothing the top for an even surface.
Decorate the top with sliced bananas, berries, granola, nuts, and shredded coconut for a colorful, inviting look.
Finish by drizzling honey over the toppings if desired, adding a touch of sweetness and shine.
Serve immediately with a spoon, enjoying the cold, creamy texture and burst of fruity flavor in every bite.