Place butter in a skillet and melt until lightly browned.
In a bowl, whisk browned butter with sugar alternatives until smooth and glossy.
Add egg and vanilla extract, mixing until combined.
Stir in baking soda, flour, and salt until a soft dough forms without overmixing.
Fold in chocolate chips and chocolate chunks evenly.
Cover and refrigerate the dough for 30 minutes.
Preheat air fryer to 315°F (157°C) for 3–5 minutes.
Shape dough into a thick round cookie and flatten slightly.
Line air fryer basket with parchment paper and place the cookie inside.
Air fry for 8–10 minutes until edges are golden and center is set.
Let cookie cool in basket for 5 minutes, then transfer to a wire rack.