In a medium bowl, mix together all-purpose flour and baking soda. Set aside.
In another bowl, using an electric mixer, whisk together butter and peanut butter. Add sugars and mix until well combined.
Next, whisk in the egg and milk, vanilla extract, until combined.
Slowly add the flour mixture and mix until just combined. Do not overmix.
Using a spatula, stir in the chocolate chips.
Preheat the air fryer to 350 degrees F.
Roll about two tablespoons of cookie dough into a ball and using a fork, flatten the cookies.
Place cookies into the air fryer baskets or onto the air fryer trays.
Air fry the cookies for 7 to 8 minutes.
Remove cookies from the air fryer and arrange them on a wire rack to cool.
