CROCKPOT CRANBERRY CHICKEN 1 small onion, thinly sliced 1 cup fresh or frozen (unthawed) cranberries 12 skinless, boneless chicken thighs (about 2 1/4 lbs. total) 1/4 cup catsup 2 tablespoons firmly packed brown sugar 1 teaspoon dry mustard 2 teaspoons cider vinegar 1 1/2 tablespoons cornstarch blended...