Peel and core the apples. Cut into bite-sized cubes.
In a medium sauce pan, add the sugar, butter, vanilla extract and cinnamon. Cook over medium heat until melted.
Add the apple pieces to the pan and cook for 5 minutes until they begin to soften some.
In a small bowl or cup, stir together the cornstarch and water into a slurry.
Pour this into the pan and continue to cook for 1-2 minutes. The liquid should begin to thicken.
You can use this apple pie filling right away or allow to cool and store in a large jar or another airtight container in the refrigerator for at least 2 weeks.
Notes
Granny Smith is my favorite apple variety to use for apple pie but any apple can work.You can swap the cinnamon for a spice mixture like pumpkin pie spice if you like.This recipe can also work for similar fruits, like pears if you want to make a pear pie filling instead.