Add to a blender. Blend until very smooth, stopping to scrape down the sides as needed.
Add a tiny pinch of cinnamon if desired.
Serve immediately.
Notes
To store, place into small airtight storage containers and store in the fridge.
To freeze, place into an ice cube tray, freeze, then transfer frozen cubes to a freezer bag and freeze for up to 3 months. Thaw overnight in an airtight container in the fridge.
To make a thicker banana puree, you can simply mash a ripe banana until mostly smooth using a fork or potato masher.
Add a sprinkle of cinnamon for additional flavor.
To help prevent the puree from browning, you can add a few drops of an acid such as fresh lemon or orange juice.
Mix with whole milk plain yogurt, baby oatmeal, mashed avocado, sweet potato, or any other baby food you like as desired.