In a pot on the stove top, boil fresh green beans till soft. This will only take about 5 minutes or so.
Drain the fresh green beans.
Place green beans in a tin pan the size that will fit in your air fryer along with butter, mayo, salt and garlic powder. Mix together. Top with parmesan cheese. I used a 9 inch round cake pan. You can line your air fryer with aluminum foil with about 2 inches coming up the edges to hold the ingredients in.
Bake in the air fryer at 400 degrees for about 9 minutes or until golden brown and fully heated.