Cream shortening and vanilla; beat in sugar until mixture is light. Add egg and beat well. Sift dry ingredients together twice; add to the creamed mixture, beating on low speed until blended. Stir in banana and blend well. Fill greased cupcake pans or paper liners about half full. Bake at 375° for 20 minutes, or until cupcakes spring back when lightly touched in center. Makes about 12 cupcakes.