Combine ground turkey, spinach, ricotta cheese, parsley, Parmesan cheese, salt, garlic powder, and red pepper flakes in a bowl.
Gently pack turkey mixture into a ¼ cup measuring cup or ice cream scoop and form into meatballs. Lightly season the outside of meatballs with additional salt.
Spray meatballs all over with cooking spray and arrange in a single layer in the frying basket, working in batches as needed.
Lower the frying basket into the cooking pot and close the air fryer lid. Cook at 420°F until meatballs are browned on top and have an internal temperature of 165°F, about 12-14 minutes. Repeat with remaining meatballs.
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