Add apples, cider, brown sugar, lemon juice, cinnamon, nutmeg, cloves and salt to the inner pot; stir and scrape the bottom clean.
Lock the lid, set the valve as directed by the manual, and cook at high pressure for 10 minutes. Allow a 15-minute natural release before carefully releasing remaining pressure.
Open away from your face. Blend the apples directly in the pot until completely smooth, keeping the blender head submerged to prevent splashes.
Select low sauté. Cook uncovered for 15 to 25 minutes, stirring more frequently as it thickens and shielding against hot splatters.
Drag a spoon across the pot; the path should stay visible briefly, and a chilled spoonful should mound rather than release watery liquid.
Turn off the cooker, stir in vanilla, and cool before transferring to clean covered containers. The apple butter thickens further when chilled.