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Mix together flour, salt, and baking powder.
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In another bowl, cream butter and sugar with a hand mixer.
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Add in egg, and beat until well combined.
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Slowly add the dry ingredients, beating until just combined into a dough (do not overmix).
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Add chopped rosemary and beat for 20 seconds, until mixed inches
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Roll dough into a log (or two), wrap in waxed paper, and refrigerate for 4 hours or overnight. The dough can be frozen at this point.
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Preheat the oven to 400.
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Slice dough into rounds 1/4 inch thick.
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Lightly grease a baking sheet and place cookies 1 inch apart.
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Bake for 8 to 10 minutes, until the cookies are very lightly browned.
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Cool cookies on a cookie rack. They taste best when cooled completely.