Lime Sugar Cookies

Directions

1. 1
   Beat together butter, shortening, granulated sugar, and 2 tablespoons lime sugar with an electric mixer until light and fluffy.
2. 2
   Beat in egg and vanilla.
3. 3
   Sift flour, baking powder, and salt together over egg mixture, then beat on low speed until just combined.
4. 4
   Form dough into a 10-inch log (2 inches in diameter) on wax paper, then wrap in wax paper.
5. 5
   Chill dough until firm, at least 4 hours.
6. 6
   Preheat oven to 375F.
7. 7
   Remove wax paper and cut log into 1/4-inch-thick rounds.
8. 8
   Bake cookies 1/2 inch apart on ungreased baking sheets in batches in middle of oven 10 to 12 minutes, or until pale golden.
9. 9
   Immediately transfer with a metal spatula to a rack set over a sheet of wax paper and sprinkle tops with remaining lime sugar.
10. 10
    Cool cookies.