Combine the cornstarch, soy sauce, and oyster sauce in a small bowl. Add the chicken, mix well, and marinate in the fridge.
In another bowl, combine the soy sauce, sherry, water, chicken stock, oyster sauce, cornstarch, and brown sugar. Set aside.
Heat a wok with about 2 tablespoons of oil. Add the chicken and let it rest for about 30 seconds before stirring. Cook for 4-5 minutes or until chicken has fully cooked; remove and keep warm.
Stir the onion, then add the garlic, ginger, and chili sauce. Continue stirring for another 2-3 minutes.
Add the sauce mixture and basil, and stir for about 2 minutes. Follow with the cashews, cooked chicken, and green onions. Stir for about 1 minute until everything fully combines.
Take it off the heat and serve over rice.
Notes
Please remember that the nutritional information is a rough estimate and can vary significantly based on the products used in the recipe.