To make the apple pie compote, add diced apples, maple syrup, lemon juice, and cinnamon sticks to a saucepan. Bring the mixture to a boil over medium heat. Cook, stirring occasionally, until the apples are tender, about 12-20 minutes.
Remove the cinnamon sticks from the pot and transfer the apple mixture to a food processor. Add the vanilla extract and pulse until the mixture resembles chunky applesauce. If you're not preparing the jars immediately, transfer to an airtight container and store in the refrigerator.
To assemble the overnight oats, add all of the ingredients to a mason jar. Shake to combine. Chill in the refrigerator overnight.
Notes
There is enough apple compote to make 5 servings.
The oatmeal will stay fresh in the refrigerator for up to 5 days.