Prepare the Sauce: Combine all sauce ingredients in a small mixing bowl. Set this aside while you prepare the chicken, allowing the flavours to meld.
Season the Chicken: In a separate bowl, toss the chopped chicken with seasoned cornstarch until evenly coated. Set this aside as you heat your skillet.
Cook the Chicken: Heat oil in a skillet over medium-high until it shimmers and is hot. Add the chicken and sauté until it's evenly browned and crispy, about 5-6 minutes.
Add Vegetables: Introduce thinly sliced bell peppers to the skillet. Cook for 2-3 minutes until they start to soften but still retain some crunch.
Combine and Simmer: Pour the prepared sauce over the chicken and peppers, and bring to a boil. Reduce the heat and let it simmer, stirring occasionally, until the sauce thickens to your liking.
Serve and Garnish: Serve the sticky chicken over a bed of fluffy rice. Garnish with chopped peanuts and thinly sliced green onions for added texture and flavour.