Pre-heat your air fryer to 350 degrees.
Mix together the butter and peanut butter in a medium sized bowl.
Add the sugar and vanilla and mix until creamed together.
Add the egg and stir together.
Add the baking powder, salt and flour on top of the butter/sugar/egg mixture.
Use a fork to lightly mix the dry ingredients together while they rest on top of the other ingredients.
Mix the combined dry ingredients into the wet ingredients until the cookie batter forms.
Fold in the pretzel pieces and chocolate chips.
Divide the dough in half, shape into 2 large cookies and place on the tray for your air fryer that is prepped with non-stick spray.
Chill the uncooked cookies in the freezer for 10 minutes
Air fry at 350 for 12-15 minutes. Wait until the cookies are cool enough to touch but still a little bit warm and enjoy!