Combine chicken, egg whites and soy sauce in a bowl and let stand 15 minutes.
Meanwhile, heat oil in a large Dutch oven or deep fryer to 360 F.
Working in batches, remove chicken from marinade. Shake off excess then roll in the cornstarch. Fry until golden brown and cooked through, about 5 minutes. Remove to a paper towel-lined plate.
Make the sauce by heating 1 tablespoon of oil (you can also use 1 tablespoon of the oil from the fryer) in a large skillet. Add the garlic and red pepper and stir-fry for 15 seconds.
Dissolve the cornstarch in the water and stir into the skillet. Add the Orange Sauce and soy sauce. Reduce heat to a simmer and continue simmer, stirring, until thickened.
Add in the chicken and stir to coat.
Serve over rice topped with green onions.
Notes
Nutrition values do not include the Kikkoman Orange Sauce.