01 - Peel, core, and slice the apples into uniform 1/2-inch wedges for even cooking.
02 - Place apple slices in the Instant Pot. Sprinkle brown sugar, cinnamon, nutmeg (if using), and salt evenly over the top.
03 - Drizzle with maple syrup or honey if desired, then add the water or apple juice.
04 - Distribute the small pieces of butter evenly across the apple mixture.
05 - Close the Instant Pot lid and set the valve to sealing. Cook on high pressure for 2 minutes.
06 - When the cooking cycle completes, allow natural pressure release for 3 minutes, then carefully quick-release any remaining pressure.
07 - Open the lid and gently stir in the vanilla extract. For a thicker syrup, select 'Sauté' and simmer for a few minutes while stirring gently. Serve warm as-is, or over oatmeal, pancakes, or ice cream.