Mix the apples with lemon juice, 3 tablespoons of brown sugar, and cinnamon.
Place the dough on a piece of parchment paper and pile the apples in the crust leaving a 1-inch border around the edges.
Fold one edge towards the center, repeating the fold all the way around the crust.
Sprinkle evenly with the remaining sugar.
Cut the parchment paper around the edges of the galette so everything will fit into your air fryer. Carefully lift the galette and place it into the air fryer basket.
Bake at 360°F for 16-20 minutes or until dough is golden brown and apples are soft.
Remove from the air fryer and gently lift out using a large, flat spatula. Let cool for 20 minutes before slicing and serving.
Notes
You may have leftover apples, depending on their size. They make a great snack after being coated in the brown sugar and cinnamon.Check the size of your air fryer basket to know the exact size you will be able to fit. Be aware that the actual size of the galette will be 1-1.5 inches smaller in diameter later because you fold over the edges. If you want a shiny surface, brush the edges with some whisked egg yolk or milk before baking.