Medium dice bell peppers, onion and chicken.
Make the sauce by mixing all ingredients for the sauce in a small bowl until combined.
Make cornstarch slurry by mixing cornstarch and water in a small bowl until combined.
Heat up 1 tsp of oil in a non-stick skillet or wok over medium heat. Add diced onion and bell peppers and cook for 5 minutes or until desired tenderness. Add a splash of water if vegetables start to burn before they are cooked. When done, remove from heat and set aside.
Heat up 1 tsp of oil in a non-stick skillet or wok over medium heat. Add chicken and stir fry until golden brown.
Add bell peppers, pineapple chunks and sauce to skillet. Give everything a good stir and let cook until the sauce starts to simmer.
Add cornstarch slurry to skillet and stir to combine with everything else. Continue cooking for 1-2 minutes or until the sauce thickens to your liking.
Remove from heat and serve with steamed rice.