Chop the chicken and bell peppers into 2 to 3 inch pieces.
Blend the cashew nuts with 2 tablespoon water to make a paste.
Mix all the ingredients listed under marinade. Then add the cashew nut paste to the marinade and mix well.
Add the chopped chicken and bell peppers to the marinade. Mix and coat the chicken well. Cover with a lid and let the chicken and bell peppers sit in the marinade for an hour.
When you are ready to cook, rub the inside of the air fryer basket with oil.
Preheat the air fryer at 350°F for 5 minutes.
Air fry at 360°F for 18 minutes. When 8 minutes are remaining, coat the chicken with 1 tbsp butter and some oil. Flip the chicken gently with tongs. If you like it slightly charred then the full 18 minutes is good or else you can take it out at the 15 minute mark. I keep mine for 18 minutes since I like the burnt tikka flavor.
Repeat until you run out of chicken.