In a bowl combine 2 tablespoons brown sugar, cinnamon, and lemon juice until combined.
Add apples to bowl and toss to coat evenly.
Grab an oven safe dish that will fit in your air fryer, heavily grease dish and place apples into it.
Cover with aluminum foil and place something oven safe on top to hold in place.
Cook at 350 for 15 minutes.
In another bowl, combine remaining brown sugar, flour and oats.
Cut butter into pats and add to mixture.
Use a pastry cutter or forks to cut butter into mixture and form crumbs.
Remove dish from fryer. Remove weight and discard foil.
Add topping and cook at 350 for additional 10 minutes until golden brown.