Preheat the air fryer to 350°F.
Wash, peel, and dice apples into small pieces. Combine diced apples, lemon juice, white granulated sugar, cinnamon, and maple syrup together in a bowl.
Butter a Cocotte or ramekins and spoon in the apple mixture .
Air fry for 15 minutes or until apples are cooked through.
In a bowl, mix together butter, brown sugar, oats, flour, and cinnamon.
Top apples with oatmeal topping and cook for another 5 minutes.
Serve with a scoop of vanilla ice cream.