Sprinkle cornstarch over pork slices and toss until well coated.
Heat half of the oil in a large skillet over medium-high heat. Add pork and stir-fry for 3 to 4 minutes or until cooked through; remove from skillet and keep warm.
In the same skillet, heat remaining oil. Add bok choy, bell peppers and carrots; stir-fry for 4 minutes or until tender-crisp.
Return pork to the skillet along with remaining ingredients; cook and toss until heated through.