Add frozen berries and banana to a blender and blend on low until small bits remain – see photo.
Add a bit of coconut or almond milk and protein powder (optional), and blend on low again, scraping down sides as needed, until the mixture reaches a soft serve consistency (see photo).
Scoop into 1-2 serving bowls (amount as original recipe is written // adjust if altering batch size) and top with desired toppings (optional).