1. 1. Begin by mixing the all-purpose flour, cornstarch, salt, and black pepper in a bowl. In a separate bowl, beat the eggs. Dip each piece of chicken into the egg mixture, then coat it thoroughly in the flour mixture. Repeat this process for all the chicken pieces, ensuring they are evenly coated.

2. 2. Heat the vegetable oil in a large skillet over medium-high heat. Fry the coated chicken pieces in batches for 3-4 minutes per side, or until they are golden brown and cooked through. Drain the fried chicken on paper towels to remove any excess oil.

3. 3. In a saucepan, whisk together the orange juice, sugar, soy sauce, rice vinegar, cornstarch, orange zest, crushed red pepper flakes (if using), garlic, and ginger. Bring the mixture to a simmer over medium heat, stirring constantly until the sauce thickens, about 3-5 minutes.

4. 4. Add the fried chicken pieces to the orange sauce and gently toss to coat the chicken evenly. Serve the delicious Orange Chicken hot, either over a bed of steamed rice or alongside your favorite steamed vegetables.