Meanwhile, in 10-inch skillet, heat oil until hot. Cook onion in oil until soft and translucent. Season lightly with salt. Add chicken stock; heat to simmering. Stir in cream cheese until melted and combined. Stir in 2 tablespoons plus 2 teaspoons of the ranch dressing mix. Pour mixture over noodles. Fold in chicken, bacon and frozen peas. Spread in baking dish.