Cut the chicken thighs into 1-inch chunks and place them in a bowl. Add the 1/3 cup cornstarch and toss until all pieces are evenly coated—this creates the crispy exterior that makes air-fried chicken so satisfying. While the chicken sits, dice the onion into 1/2-inch pieces, cut both peppers into 1-inch squares, mince the garlic, and cut the pineapple into bite-sized chunks. Having everything prepped and ready ensures smooth cooking without interruptions.
Lightly grease your air fryer basket and arrange the cornstarch-coated chicken in a single layer. Air fry at 390°F for 10 minutes, then open the basket, stir the chicken, give it a light spray of cooking oil, and continue cooking for another 5-10 minutes until the internal temperature reaches 165°F. The oil spray helps deepen the golden-brown color and ensures maximum crispiness. I like to check the chicken a minute before the minimum time is up so I can pull it at the perfect moment—overcooked air-fried chicken can become dry.
While the chicken finishes cooking, combine the pineapple juice, soy sauce, worcestershire sauce, brown sugar, ginger, sesame oil, and minced garlic in a saucepan over medium-high heat. Bring to a boil, then add the diced onion, pepper chunks, and pineapple chunks from Step 1. Let everything simmer together for 2-3 minutes so the vegetables soften slightly and all the flavors meld—this creates the sweet and savory sauce that makes Hawaiian chicken special.
In a small bowl, whisk together the 1/2 tablespoon cornstarch and 1/2 tablespoon water to create a slurry, then stir it into the simmering sauce from Step 3. Let it cook for 2-3 minutes, stirring occasionally, until the sauce thickens and becomes glossy—this gives the dish a beautiful, restaurant-quality finish. Once the chicken from Step 2 reaches 165°F, transfer it to the saucepan and toss gently to coat every piece with the sauce. I prefer to add the chicken to the sauce rather than the other way around because it helps maintain the crispy coating better.
Transfer the Hawaiian chicken to a serving dish or individual bowls and serve immediately over steamed rice. The combination of crispy chicken, tender vegetables, and glossy sweet-savory sauce creates the perfect balance of textures and flavors.