Prepare couscous according to package directions. Keep warm.
Heat oil in large nonstick skillet over high heat. Stir-fry chicken for 5 minutes until well browned. Transfer to bowl.
In the same skillet, stir-fry bell pepper and onion strips for 3 minutes until crisp-tender. Return chicken to the skillet. Stir in 2/3 cup of water, mustard and barbecue sauce. Heat to boiling, stirring often. Serve over couscous.
Preparation 10 minutes, cooking time 10 minutes
Servings: 4