You should probably look into needto's better bars as well. They are very nutritionally dense and will definitely help to add mass.
http://www.needtobuildmuscle.com/store/Snacks-amp-Meal-Replacements/Better-Protein-Bars-p18.html
http://www.needtobuildmuscle.com/store/Snacks-amp-Meal-Replacements/Better-Protein-Bars-p18.html