Preheat the oven to 350°F. In a small bowl, beat the eggs with the garlic powder and onion powder. Dip the chicken pieces in the egg mixture, then coat with cornflake crumbs.
In a large skillet, heat the oil over medium heat. Fry the coated chicken pieces in the oil on both sides until golden and crispy. Let drain on paper towels for a few minutes, then transfer the chicken to a baking pan.
In a bowl, combine all the sauce ingredients. Pour the sauce over the fried chicken. Bake the chicken, covered, for 20 minutes (do not overbake). Spoon the sauce from the bottom of the pan over the chicken, garnish with the chives, if desired, and serve warm.