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Sift together flour, baking powder & salt in bowl.
In a separate bowl cream together butter and sugar and beat until light and fluffy.
Blend in eggs & vanilla.
Add dry ingredients. Mix well.
Wrap dough in wax paper and/or plastic wrap, and chill in refridgerator over night.
Roll out and sprinkle with flour.
Bake at 400 degrees for 6-8 minutes. (6 for softer cookies, 8 for crispier)