Zest and juice the orange into the inner pot of the Ninja Foodi. Add the sugar to the inner pot.
Core, peel and quarter the apples. Add them to the inner pot. Stir a few times while you are adding the apples to prevent browning.
Put the pressure lid on and turn the valve to seal. Set the pressure to high and the time to ZERO minutes. After the pot builds pressure, it will beep that it is done. Do an immediate release.
Stir the apples and break them up into smaller pieces if needed. I use my Mix 'N Chop and it works great.
Add the vanilla extract. Stir and taste for seasonings. Add more seasonings and/or sugar if desired. Allow to cool until you are ready to use your pie filling.
if you are using an 8qt Ninja Foodi or other pressure cooker, add ¼ cup of water or apple juice before pressure cooking.
If you need to thicken your pie filling, turn the sear/sauté on and mix 1 Tablespoon of cornstarch with 1 Tablespoon of water until smooth. Add to the apples and heat until thickened.