To prepare sauce: In medium-size bowl or large measuring cup, blend water and cornstarch. Stir in remaining sauce ingredients; set aside. To prepare stir-fry: In large skillet or wok, heat 1 tablespoon oil over medium-high heat. Add chicken and stir-fry until lightly browned and cooked through, about 8 minutes. Using slotted spoon, transfer chicken to bowl; cover to keep warm. Heat remaining 1 tablespoon oil in same pan. Add broccoli; stir-fry about 2 minutes. Add bell pepper and scallions; continue to stir-fry until broccoli and pepper are crisp-tender, about 3 minutes. Reduce heat to medium. Stir set-aside sauce to remix; pour over vegetables. Cook, stirring constantly, until sauce becomes clear and thickens slightly, about 1 minute. Stir in chicken and cashews. To serve, spoon bed of rice onto dinner plates; top with stir-fry mixture. Serve immediately. Makes 4 servings.