Add frozen bananas, cinnamon, and almond milk to a high-speed blender or food processor.
Blend until thick, creamy, and completely smooth.
Stop occasionally to scrape down the sides as needed.
Add additional almond milk, one teaspoon at a time, if needed for blending.
Serve immediately for a soft-serve texture.
For a firmer scoopable dessert, transfer to a container and freeze for 30-minutes or more.
If fully frozen, allow to soften at room temperature for 5–10 minutes before serving.
Add desired toppings and enjoy.