Preheat oven to 400 degrees Fahrenheit. Spray a sheet tray with non-stick cooking spray. Dip chicken pieces in egg, then roll in flour, and then roll in bread crumbs until fully coated. Place on a baking sheet. Bake for 15-20 minutes until chicken is cooked through and lightly browned.
Add all sauce ingredients except the cornstarch and 1 tablespoon water. Bring to a low boil. In a small bowl, dissolve cornstarch in water, then add to the mixture. Stir until sauce boils again and cook just until thickens, reduce heat. Add chicken to pan and coat in the sauce. Garnish with green onions!
