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