Cut the chicken into bite sized pieces and place on a plate or in a bowl. In a separate bowl, mix the flour, cornstarch, salt, pepper and garlic powder together. Add the chicken pieces a handful at a time into the flour mixture and cover each piece completely.
Place the chicken pieces into a 9x13 pan that has been drizzled with melted butter or olive oil. Cut the butter into small pieces and place them evenly around the chicken in the baking dish. Bake at 375 degrees for 20-30 minutes, the time can vary depending on the size of your chicken chunks.
Throughout the baking time I turned my chicken pieces so they could get browned by the butter on all sides. If necessary add a few more butter pieces to the pan.
While your chicken is cooking combine the sauce ingredients in a bowl and ten minutes before you remove the chicken from the oven pour the sauce over the chicken. Continue to bake until the sauce is warm and bubbly. Remove from the oven and serve over sticky rice.