whisk dry ingredients until no lumps and set aside. In another bowl mix butter, sugar and add eggs one at a time whisking well. Then add vanilla. mix all ingredients together, add nuts if you like.I add pecans.You can also line pan with foil after spraying it with pam. Cook 25 min, place on cooling rack until cool then cut even. If you wipe the knife each time you slice there will be no crumbs.