In a large skillet, cook onion, carrots, celery and peppers in oil over medium heat about 5 minutes.
Meanwhile, in a small bowl, combine cold water and cornstarch. Stir to combine. Add broth, oyster sauce and soy sauce.
Add garlic to vegetables and cook 1 minute more.
Add turkey, sauce mixture and peas; cook, stirring constantly 2-3 minutes until sauce is boiling and thickened.
Serve over chow mein noodles with rice and additional soy sauce if desired.