Bring 4 cups (1 L) water to a boil in 2-quart (2 L) saucepan over high heat. Remove from heat and add tea bags. Steep until desired strength, 3 to 5 minutes. Remove bags and discard. Add Knorr® Beef Bouillon Cube(s) and return to a simmer. Add chicken and simmer until chicken is thoroughly cooked, about 8 minutes. Remove chicken and shred. Return to pot and cook 1 minute; drain.
Heat oil in large nonstick skillet over medium-high heat and cook vegetables, stirring occasionally, until vegetables are tender, about 6 minutes. Stir in hoisin sauce and chicken.