Wash the mushrooms, shake the water off, pop into food processor bowl and purée.
Add to the food processor bowl all the seasoning items from the Maggi down to the black pepper, and whiz for another minute.
Take out, transfer to a large bowl, add the ground turkey and mix well with your hands (don't purée this mixture in the food processor or it could make the meat tough.)
Divide the mixture into five and form into five patties. With your thumb, put an indent in the centre of each one to prevent the patties bunching up in the middle.
Spray with cooking spray both sides of the patties.
Place in basket of hot air fryer. Don't stack them; it is okay if sides touch. Put basket in machine, put temperature to 160 C (320 F) and cook for 10 minutes for medium (or longer to desired degree of doneness.) An instant read meat thermometer should read 75 C (165 F.) There is no need to turn the patties during cooking.