1Slice the chicken breast into thin strips.
Peel and slice the onions into thin rings.
In a bowl, mix the all-purpose flour, cornflour, and black pepper.
Coat the chicken strips with the flour mixture.
Heat the vegetable oil in a large pan over medium-high heat.
Add the chicken strips to the pan and stir-fry until they are golden brown and cooked through, about 5-7 minutes.
Remove the chicken from the pan and set aside.
In the same pan, add the sliced onions and stir-fry until they are soft and translucent, about 3-4 minutes.
Return the chicken to the pan and add the soy sauce.
Stir everything together and cook for another 2 minutes to combine the flavors.
Serve hot and enjoy your Chicken and Onion Stir-Fry.