First marinate the chicken with the salt, soy sauce, cornstarch, and sesame oil for at least 15 minutes
Prepare the vegetables, dice the potatos, carrots, onions, and garlic into whatever shape that you prefer
Boil water
Heat the wok, then add vegetable oil
On high heat, brown both sides of the chicken (1 minute per side)
Stirfry garlic briefly until fragrant, then add onions and saute until soft (2 minutes). Set aside
Add potatoes and carrots, cook for 5 minutes, watching carefully
Add chicken, onions, and garlic back into the pan and fry for a minute
Add boiled water, turn heat to medium and cook for 10 minutes. Watch to make sure water doesn't evaporate, if it does, top it off with 1/4 cup of water
Stir in oyster sauce and soy sauce. Cover to cook for another 5 minutes
Mix in cornstarch slurry slowly until sauce thickens. Cook uncovered for another 5 minutes or until you reach desired consistency. Serve over rice!