01 - Place the frozen banana slices in a high-powered blender or food processor.
02 - Add cocoa powder, peanut butter, protein powder, maple syrup, and almond milk.
03 - Blend until smooth and creamy, stopping to scrape down the sides as needed. Add a splash more milk if mixture is too thick.
04 - Taste and adjust sweetness if necessary.
05 - Serve immediately for a soft-serve texture, or transfer to a container and freeze for 2–4 hours for a firmer, scoopable consistency.
06 - Scoop into bowls and top with chocolate chips and chopped peanuts, if desired.