In mixing bowl combine butter, shorting and cream well. Add sugar and egg, mix well. Add vanilla, flour, baking powder and salt. Add chopped cherries. Mix well. Roll up in wax paper and shape like a log. Chill 4 hours and slice and bake at 350 for 8-10 minutes.
You can wrap extra in saran wrap and keep chilled in the fridge for a week and slice and bake as needed.