Prep the bananas: Peel the bananas, slice into coins about 1/2 inch thick, and place on a parchment-lined tray. Freeze until solid, at least 2–3 hours or overnight.

Set up your blender or food processor: Add the frozen banana slices to the bowl or pitcher. Start with 2 tablespoons of milk.

Pulse, then blend: Pulse several times to break up the chunks. Blend on low, stopping to scrape down the sides as needed. Add small splashes of milk only if it’s too thick to blend.

Keep going until smooth: It will look crumbly at first, then sandy, then suddenly turn creamy and soft-serve-like. Be patient; this switch happens fast.

Taste and tweak: If you’re using add-ins like cocoa or peanut butter, blend them in now. Adjust sweetness or thickness with more banana or a tiny bit more milk.

Serve soft-serve style: Enjoy immediately for a soft-serve texture. For a scoopable texture, transfer to a freezer-safe container and freeze 1–2 hours, then scoop.