Place the frozen banana, berries, peanut butter, and milk into your high-speed blender.
Blend on high for about 1-2 minutes, stopping to scrape down the sides with a spatula as needed. The mixture should become thick, smooth, and scoopable, with a vibrant color from the berries.
Taste the mixture and add honey if you'd like a sweeter flavor, then blend briefly to combine.
Scoop the thick, creamy smoothie into a serving bowl, smoothing the top with the back of a spoon.
Decorate the top with slices of fresh fruit, granola, or a drizzle of honey to add crunch and visual appeal.
Serve immediately with a spoon, enjoying the vibrant colors, creamy texture, and nostalgic flavors.