Cut chicken tenderloins up into bite-sized pieces, about 1 inch by 1 inch
Add cornstarch, flour and chicken seasonings to a plate and stir to combine. Add chicken pieces to the plate, one by one, and completely coat with the flour mixture
Preheat air fryer to 400 degrees and spray with cooking spray. Add coated chicken pieces
Cook for 1 minute then spray with cooking spray. Cook for 3 more minutes. Flip chicken over then spray again. Cook for another 4-6 minutes, until fully cooked
Sauce
Meanwhile, heat sesame oil up in a small pan over medium heat. Add minced garlic and cook for about 1-2 minutes, until fragrant
Add the remaining sauce ingredients and stir together to dissolve the brown sugar
Bring to a boil then reduce the heat to low/medium. Simmer for about 10 minutes, until thickened
Once the chicken is cooked, add to the pan with the sauce and toss to coat