Prep your blender: Add ice first, then the frozen banana, protein powder, almond milk, vanilla, sweetener, salt, and thickener (if using).
Pulse to break the ice: Use short pulses until the ice starts to crush and the mixture looks slushy.
Blend on high: Blend 30–60 seconds until smooth, thick, and creamy.
If the blender struggles, add 1–2 tablespoons more milk.
Adjust sweetness and texture: Taste and add a little more sweetener, vanilla, or salt if needed. For thicker texture, add a few more ice cubes and blend again.
Serve soft-serve style: Spoon into a chilled bowl and enjoy right away for a creamy, frosty texture.
Optional firm-up: For scoopable ice cream, transfer to a shallow container and freeze 20–30 minutes, stirring once halfway.