In a large mixing bowl beat butter with an electric mixer on medium to high speed for 30 seconds. Add granulated sugar, baking powder, and salf. Beat until combined, scraping sides of bowl occasionally. Beat in egg, milk, and vanilla until combined. Beat in as much of the flour as you can with mixer. Stir in any remaining flour. Divide dough in half. If necessary, cover and chill dough 30 minutes or until easy to handle (you can also chill dough 24 hours if desired).
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