Cream together butter, shortening and sugar. Add vanilla and mix. Add eggs one at a time, beating well after each addition. Sift salt with flour and stir into batter.
Drop by teaspoonful onto greased baking sheet and flatten by pressing with flat bottom tumbler, dipped in flour before pressing. Bake at 375 for 8 to 10 minutes or til edges are delicately browned. Remove at once from baking sheet. Makes 6 dozen wafers.
From the recipe files of Mrs. Noah Kimball