**Prepare the Air Fryer:**

Preheat your air fryer to 320°F (160°C) for 3-5 minutes. Lightly grease a round cake pan or line it with parchment paper.

**Mix the Wet Ingredients:**

In a mixing bowl, combine melted butter, granulated sugar, and brown sugar. Stir until smooth. Add the egg and vanilla extract, mixing well.

**Combine Dry Ingredients:**

In a separate bowl, whisk together flour, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Fold in the chocolate chips.

**Assemble the Cookie Cake:**

Transfer the cookie dough to the prepared pan, spreading it evenly. Sprinkle extra chocolate chips on top if desired.

**Bake in the Air Fryer:**

Place the pan in the preheated air fryer and bake at 320°F (160°C) for 14-16 minutes, or until the edges are golden brown and the center is set.

**Cool and Serve:**

Let the cookie cake cool in the pan for 5-10 minutes before slicing. Serve warm with ice cream or enjoy as is!