Heat oil in large skillet over medium-high heat. Season chicken with salt and pepper.
Cook chicken through, 4 to 6 minutes. Transfer to plate.
Add bok choy and 1/4 cup water. Cover and cook, 2 to 3 minutes.
In small bowl, combine soy sauce, bbq sauce and onions. Add to skillet and bring to boil.
Return chicken to skillet with bok choy, just heat through and Serve.
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