Cream together the softened butter and granulated sugar until light and fluffy.
Mix together the all-purpose flour, baking powder, and kosher salt in another bowl.
Fold the dry mixture into the creamed butter and sugar, then add buttermilk to create a soft dough.
Fold in the shredded cheddar cheese, diced apples, and cooked bacon until evenly distributed.
Spray the scone pan with cooking spray, scoop the batter into the pan, and brush with egg wash.
Air fry at 320 degrees F for about 12 to 15 minutes until golden brown.
Remove from air fryer, let cool slightly, and serve warm.