Place the sauce ingredients in a small bowl and whisk to combine. Set aside.
Preheat air fryer to 400ยบ F.
Place the cornstarch in a bowl or plastic bag.
Sprinkle Dash Original Seasoning on the chicken then add to the bowl with cornstarch and toss until completely coated.
Spray the basket with cooking spray and place the chicken in a single layer in the air fryer basket. Do not overcrowd the basket, you may need to cook in batches.
Spray the chicken lightly with cooking spray. Air fry the chicken for 7 - 9 minutes, shaking half way through the cooking time. Note: the chicken should be cooked through and crispy but will be a very pale color.
Meanwhile, heat 1 tsp of oil in a large skillet and cook the onion and bell pepper for 2 - 3 minutes. Add the pineapple and heat an additional minute.
Add the sauce ingredients and cook over medium heat stirring continuously, until slightly thickened. Remove from heat.
Add the cooked chicken to the pan and toss to fully coat the chicken with the sauce.
Serve over rice topped with sliced green onions, if desired.