Add the frozen banana, frozen berries, Greek yogurt, almond milk, protein powder, almond butter, and chia seeds to a high-speed blender.
Start blending on low speed, then increase to high, using a tamper to push ingredients toward the blades if needed.
Blend until the mixture is completely smooth, thick, and has a soft-serve ice cream consistency (add only 1 extra tablespoon of milk if it won't blend).
Stop and scrape down the sides of the blender with a spatula to ensure everything is incorporated.
Pour the thick mixture into a serving bowl and use the back of a spoon to create swirls on top.
Arrange your chosen toppings (granola, fresh fruit, coconut, and hemp seeds) artistically over the top.
Drizzle with a little honey or extra nut butter and serve immediately with a spoon.