Once the cooking time is complete, allow the Instant Pot to naturally release pressure for Carefully open the Instant Pot lid, and use an immersion blender to puree the cooked apples until smooth. If you don't have an immersion blender, you can transfer the mixture to a regular blender, blend until smooth, and return it to the Instant Pot. Add vanilla extract, if desired. Set the Instant Pot to "Saute" mode and simmer the mixture, uncovered, for 10-15 minutes or until it thickens to your desired consistency.about 10-15 minutes.