a combination of this recipe: http://www.recipezaar.com/192346 and that recipe: http://allrecipes.com/Recipe/Peanut-Butter-Oatmeal-Cookies/Detail.aspx
The peanut butter helps hide the tase of the brewer's yeast and adds protein.
Cream peanut butter, shortening, and butter. Add brown sugar and continue creaming. Add vanilla and eggs, one at a time. Add Salt, baking soda and brewer' yeast, mix well. Stir in flour. Add oats (you may need to switch from a mixer to a wooden spoon at this step). Stir in chips. Drop by spoonfuls and bake at 350. (how long will depend on how big you make the cookies, I make them huge and bake for about 15 minutes).