Combine flour, baking powder and salt in small mixing bowl.
Beat butter, brown sugar and vanilla extract in large mixer bowl until creamy.
Beat in egg.
Gradually beat in flour mixture.
Cool completely in pan on wire rack. Cut into bars.
Stir in white chocolate chips.
Press into prepared baking pan with spatula (dough will be thick!)
Bake for 20 to 25 minutes or until golden brown.
Recipe via afewshortcuts.com