Beat softened butter, sugar, brown sugar, and the seeds from the vanilla bean together very well using a hand mixer or a stand mixer with a paddle attachment.

Then add the egg and beat well again.

Mix flour, baking soda, baking powder, and salt together, and stir it into the dough.

Roughly chop the chocolate and add it to the dough. Stir the dough until it is smooth and the chocolate is evenly distributed.

You can refrigerate the dough for about 1 hour for easier handling, but you can also proceed immediately.

Roll the dough into balls, using about 1 tablespoon of dough per ball. Place the balls on the bottom rack of your air fryer. It should be lined with parchment paper, and it's a good idea to fold the paper around the rack to prevent it from flying up during cooking. Leave enough space between the balls, so only bake 3-4 at a time. Press the dough balls lightly to flatten them before inserting the tray into the air fryer.

Bake the cookies at 160 degrees Celsius (320 degrees Fahrenheit) for 9 minutes (Air Fryer setting). Then let them cool until they are firm enough to transfer to a wire rack. Don't move them immediately, as they may break. Give them some time to firm up.