Season the chicken lightly with salt and coat evenly with corn starch, set aside.
Heat a wok on high heat, add 1 teaspoon of sesame oil and add half of the chicken. Cook 2 to 3 minutes on each side until well browned, set aside. Repeat with the rest of the chicken, cooking in batches.
Add remaining teaspoon of oil and quickly stir-fry the minced garlic and ginger until fragrant, about 1 minute.
Add the orange zest then return the chicken to the pan. Quickly stir the chicken then add the orange sauce and the chopped vegetables.
Cook until the sauce thickens and the vegetables soften, about 1 to 2 minutes.
Serve with rice and garnish with the scallion and sesame seeds.