Place the chicken pieces, bell peppers, and entire can of pineapple (with juice) into a 5-6 quart slow cooker. Season with a pinch of salt and pepper.
In a bowl, whisk together the cornstarch, honey, vinegar, soy sauce, ketchup, garlic powder, and ginger until smooth. Pour the sauce over the chicken and vegetables in the slow cooker.
Cover and cook on LOW for 3-4 hours or on HIGH for 1.5-2 hours, until the chicken is cooked through and tender. Gently stir the chicken and sauce halfway through cooking.
Once done, taste and season with additional salt and pepper if needed. The sauce will thicken as it sits.
Serve the sweet and sour chicken over cooked rice and garnish with sliced green onions. Enjoy!
