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MIX dressing, peanut butter, soy sauce and crushed red pepper; set aside. Heat 2 tsp. of the oil in large nonstick skillet on medium-high heat. Add chicken; cook and stir 5 to 8 min. or until chicken is cooked through. Transfer chicken to large serving bowl; cover to keep warm.
HEAT remaining 1 tsp. oil in same skillet. Add broccoli and bell peppers; cook and stir 5 min. or until vegetables are crisp-tender.
ADD pasta, vegetables and dressing mixture to chicken; mix lightly. If desired, gradually stir in enough of the reserved pasta cooking water until sauce is of desired consistency. Sprinkle with the onions.