First, place the banana, the frozen berries, the Greek yogurt, and the chia seeds into a blender.
Next, add one tablespoon of plant based milk, then blend until smooth.
If needed, add a little more liquid, but not too much, so that the smoothie bowl stays thick enough to eat with a spoon.
Then, pour it into a bowl, and sprinkle it with oats and seeds.
Finally, arrange the fresh berries and nuts on top.
If you'd like an even creamier, more ice cream like texture, use a fully frozen banana and add only a minimal amount of liquid.