Mix thoroughly shortening, butter, sugar, eggs and vanilla. Blend in flour, baking powder and salt. Wrap in wax paper and chill for at least 1 hour.
Heat oven to 400. Roll dough 1/8 inch thick on lightly floured board. Cut into desired shapes. Place on parchment lined baking sheet. Bake 6-8 minutes or until edges are lightly browned. Cool on wire racks.
This is just my own icing. Mix powdered sugar with water to icing consistency. Add a little vanilla. Ice cookies about 6 at a times and top with sprinkles. Let stand ideally over night.
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