Heat 1-2 tbsp. of oil in the same skillet/wok over med-high heat. Add the chicken and ¼ tsp. salt. Arrange in a single layer, cook for 1–1½ min. until browned on the bottom.
Add the green beans and stir fry sauce. Stir well. lower the heat to med-low, cook for 1-2 min. until the sauce thickens. Stir often. Taste, add salt if needed.