Put the diced chicken breast in a deep bowl, add corn starch (2 tablespoons) and mix everything thoroughly.
Heat a spoonful of sesame oil in a frying pan and fry the chicken pieces over medium heat until a toasted golden crust forms. Remove the chicken from the pan.
Add the remaining sesame oil to the pan and fry the green beans for 4-5 minutes, stirring occasionally. Then remove the beans from the pan.
Pour soy sauce into the pan, add chopped garlic, ground ginger, salt, pepper. Minced ginger root can be used in place of ground ginger. Stir the sauce and bring to a boil (1-2 minutes).
Stir the remaining starch with 50 ml of water and pour into the pan, stir and wait 1-2 minutes until the sauce becomes thick.
Transfer the fried chicken and green beans to the pan, mix and wait another 2-3 minutes. Then turn off the heat and leave the dish covered for another 5 minutes.
Serve chicken stir fry with chopped green onions and sprinkled with sesame seeds.