Combine 1/2 cup broth, 2 tablespoons cornstarch, and 2 tablespoons soy sauce in a shallow dish or heavy-duty zip-top plastic bag; add chicken. Cover or seal, and chill 1 hour.
Remove chicken from marinade, discarding marinade.
Heat oil in a large nonstick skillet or wok over medium-high heat 2 minutes. Add chicken; stir-fry 3 minutes or until lightly browned. Add vegetables; stir-fry 3 minutes. Add 1 cup broth; bring to a boil. Reduce heat, and simmer 2 to 5 minutes or until vegetables are crisp-tender.
Stir together remaining 1/2 cup broth, 2 tablespoons cornstarch, and 2 tablespoons soy sauce. Add to chicken mixture; stir-fry 1 minute or until thickened. Serve over rice; sprinkle with cashews.
*1 pound pork tenderloin, cut into thin strips, may be substituted for chicken.