Peel banana, cut it into 'coins' and freeze it.
Once frozen, throw the frozen banana 'coins' into your food processor (a blender - even a Vitamix - won't create smooth, creamy soft-serve like a food processor will).
Pulse it at first then blend on medium speed.
Wait for the magic to happen when it becomes silky smooth soft-serve ice-cream.
Remove from food processor and eat immediately, or pop it into a bowl in the freezer for 10 minutes or so if you prefer a harder consistency.
Experiment with different flavours and textures by adding vanilla pod seeds, frozen berries, shaved coconut, cacao nibs or powder, crushed nuts, peanut butter, or maple syrup.