Bake chicken breast bites as directed on package.
Meanwhile, heat oil in 12-inch skillet over medium-high heat until hot. Add celery and carrots; cook 3 to 5 minutes or until crisp-tender, stirring frequently. Add sugar snap peas and bell pepper and onion stir-fry; cook 3 to 5 minutes or until vegetables are tender, stirring frequently.
Add chicken breast bites to skillet. Stir in stir-fry sauce. Cook 3 to 5 minutes or until thoroughly heated, stirring frequently. Serve over chow mein noodles. Sprinkle with cashew halves.