PREPARE rice as directed on package. Meanwhile, mix soy sauce, dressing and ginger until well blended; set aside.
TOSS steak with cornstarch. Spray large nonstick skillet with cooking spray; heat on medium-high heat. Add steak mixture; cook and stir 3 min. or until steak is cooked through. Add vegetables and soy sauce mixture; cook and stir 3 min. or until sauce thickens and vegetables are heated through.
SERVE steak mixture over rice; top with peanuts.