Prepare chicken breasts by sprinkling with salt and pepper.
Heat Olive Oil in skillet over medium heat on stovetop. When pan is hot – add chicken breasts one at a time to gently sear. Cook on each side for 3-4 minutes. Turn and cook 3-4 minutes. Cook until juices run clear.
Mix the 1 1/2 tsp water and cornstarch together in a small bowl. Mix well and set aside.
Mix soy sauce, water, vinegar, brown sugar, garlic and ginger in a saucepan and heat over medium heat until it starts to simmer.
Add the water/cornstarch mixture to the sauce pan. Turn the heat off and stir constantly until it thickens.
When chicken is done, serve and pour sauce over the top. Garnish with toasted sesame seeds and chives.