Chill your pan: Place a loaf pan in the freezer for at least 1 hour.
Blend the base: Add coconut milk (or Greek yogurt), protein powder, sweetener, vanilla extract, and optional banana/xanthan gum to a blender. Blend until smooth and creamy.
Pour & freeze: Transfer mixture into the chilled loaf pan. Freeze for 60 minutes.
Stir to prevent iciness: Every 20–30 minutes in the first hour, stir with a fork or spatula.
Final freeze: Freeze for an additional 1–2 hours until firm.
Serve: Let sit at room temperature for 10–15 minutes before scooping. Add your favorite toppings if desired.