Heat grill pan on grill grate on high heat.
Combine peppers, onions and 2 Tbsp. dressing. Combine shrimp, soy sauce, ginger and remaining dressing in separate bowl.
Spoon pepper mixture onto hot grill pan; cook and stir 2 min. Add shrimp; cook and stir 2 min.
Add peas; cook and stir 2 to 4 min. or until shrimp turn pink and peas are crisp-tender.