In a large bowl, prepare the marinade with greek yogurt, minced garlic, salt, and garam masala. Mix well.
Place the chicken tenderloins and marinade in a large ziptop bag and close. Allow the chicken to rest inside of the marinade in the refrigerator for at least 30 minutes, up to 24 hours.
Air fry the marinated chicken tenderloins at 350F for 12 minutes (flipping halfway through) or until the internal temperature reaches 165F.
Remove the chicken from the air fryer basket and serve.