Peel, core, and chop the apples.
Add the apples to the Instant Pot.
Add ½ cup water and cinnamon, if using. Stir.
Secure the lid and cook on high pressure for 5 minutes.
Allow the pressure to naturally release for about 10 minutes, then carefully release any remaining pressure.
Blend the cooked apples with a hand mixer or immersion blender until smooth (or in a blender), or mash for a chunkier applesauce.
Allow the applesauce to cool before transferring it to mason jars or storage containers.
Store in the refrigerator for up to 7 days or freeze in freezer-safe containers for up to 6 months.