Stir together water, Knorr® Concentrated Chicken Bouillon and cornstarch in small bowl; set aside.
Heat 1 Tbsp./15 mL of the vegetable oil in a large nonstick skillet over medium-high heat and cook green beans and red bell pepper stirring frequently, until crisp-tender. Add garlic and ginger and cook 30 seconds or until fragrant. Remove and set aside.
Heat remaining oil in same skillet over medium-high heat and cook chicken, stirring occasionally, until thoroughly cooked, about 5 minutes. Add reserved vegetable and Bouillon mixtures and cook until sauce is slightly thickened, about 1 minute. Sprinkle with toasted sesame seeds and serve, if desired, with brown rice.