In a medium bowl, combine the chicken, egg whites, and salt. Use your hands to squeeze and massage the egg whites over the chicken. Set this aside for a few minutes.
In the meantime, add all the orange sauce ingredients to a small bowl and mix together. Set aside.
Add the cornstarch to the bowl, and use your hands to toss the chicken until each piece is completely coated in cornstarch. Transfer to a baking sheet dusted with cornstarch.
Heat 1 ½ inches of oil to 350°F. Fry half the chicken for 3-4 minutes until golden, crispy, and cooked through. Transfer to a paper towel-lined plate to dry, and repeat with the remaining chicken.
Heat 1 tablespoon of oil in a large nonstick pan over medium heat. Add the orange sauce and bring to a boil. Reduce to a simmer and let it bubble for 3-4 minutes until thickened. Add the chicken and toss to coat. Serve immediately.