Preheat oven to 400 degrees. Mist a large baking dish with cooking spray.
Place pineapples, onion and bell peppers in baking dish. Top with chicken thighs.
Whisk cornstarch and 1 tbsp warm water together in a small bowl.
Combine the cornstarch mixture, honey, soy sauce, vinegar, garlic, ginger, and black pepper together in a small saucepan over low heat. Allow to simmer while whisking occasionally. Bring to a boil and allow to boil for 1 minute. Turn off the heat and set aside for at least 10 minutes, allowing it to cool and thicken.
Pour sauce on top of the chicken, then turn the chicken over to make sure every inch is coated in the sauce.
Bake, uncovered for about 30-35 minutes.
Notes
The entire recipe makes 6 servingsThe serving size is 1/6th of the dish