Prepare Orange Chicken Sauce using the recipe below. Set aside.
Cut chicken pieces into 2-inch squares and place in large bowl.
In another bowl, add egg, salt, pepper and 1 tablespoon oil. Mix well.
Stir cornstarch and flour. Mix well.
Add chicken pieces to egg mixture. Stir to coat. Using a slotted spoon and shaking off the excess egg, move the chicken pieces to the flour mixture. Toss or stir to coat.
Heat oil for deep-frying in wok, large skillet or deep-fryer to 375°F.
Add chicken pieces, a few at a time, shaking off the excess flour. Fry 3 to 4 minutes or until golden and crisp. Do not overcook or chicken will be tough.
Remove chicken from oil with slotted spoon. Drain on paper towels. Set aside.
Clean wok or skillet.
Place over high heat and and heat 15 seconds.
Carefully add 1 tablespoon oil.
Add ginger and garlic and stir-fry until fragrant.
Add and stir-fry crushed chilies and green onions.
Add rice wine and stir 3 seconds.
Add Orange Chicken Sauce. Bring to boil.
Add cooked chicken, stirring until well-mixed.
Stir water into remaining 1 tablespoon cornstarch until smooth.
Add to chicken. Heat until sauce is thickened.
Stir in 1 tablespoon oil and sesame oil. Mix well.