In a large mixing bowl, combine the butter and granulated sugar. Mix until fluffy. This will ensure that you get fluffy bread. Then mix in the eggs, add in one at a time, mix after each egg, mix in the vanilla extract.
In another large mixing bowl, mix the all-purpose flour, cocoa powder, baking powder, and salt. Slowly fold the dry ingredients into the wet ingredients. Add in the milk, and mix again. Fold in the chocolate chips.
Spray your loaf pan with cooking spray, and then pour the batter into the prepared pan, filling 2/3 the way full. Set the pan into the air fryer, and set the temperature to 320 degrees F for 20 minutes. (air fryer setting)
When the time is up, place a toothpick in the pound cake, and check to see that the toothpick comes out clean. If not, add another 5 minutes.
Plate, serve, and enjoy!