Whisk together marinade and pour over chicken in a resealable container or plastic bag. Marinate overnight or at least 1 hour.
Whisk together dressing ingredients and set aside.
Grill chicken until cooked through, about 5 minutes per side depending on thickness. Allow to rest 5 minutes before slicing.
Divide all other salad ingredients into 4 servings, top with chicken, dressing, plus hummus and feta, if desired.