01 - Peel, core, and slice the apples into uniform 1/2-inch wedges for even cooking.
02 - Place the apple slices in the Instant Pot insert. Sprinkle brown sugar, cinnamon, nutmeg, and salt evenly over the top.
03 - Drizzle with maple syrup or honey if using, then add the water or apple juice to the pot.
04 - Distribute the small pieces of butter evenly across the apple mixture.
05 - Secure the lid and set the steam release valve to sealing. Cook on high pressure for 2 minutes.
06 - Allow natural pressure release for 3 minutes, then carefully quick-release any remaining pressure.
07 - Open the lid and stir in the vanilla extract. For a thicker syrup, use the Sauté function and simmer for 2-3 minutes, stirring gently.
08 - Serve warm as a standalone dessert, or use as a topping for oatmeal, pancakes, waffles, or ice cream.