Orange Dreamsicle Bars

3/4 c. unsalted butter, room temperature
2 c. packed light brown sugar
3 eggs
1 tsp. vanilla
2 Tbl. orange zest (zest of two oranges)
3 1/2 c. all-purpose flour 
1/2 tsp. salt
1 Tbl. baking powder  
1 (12 oz.) bag white chocolate chips

Preheat oven to 350 degrees.  Cream together butter and brown sugar until very light and fluffy.  Add the eggs, one at at time, beating until combined.  Mix in the vanilla and orange zest.  Add the flour, salt and baking powder and mix until just combined.  Stir in the white chocolate chips.  Press dough evenly into a lightly greased 9x13-inch baking pan.  Bake for 20 minutes.  Cool completely.  Cut into bars and serve.      

http://www.eatcakefordinner.net/2015/06/orange-dreamsicle-chewy-cookie-bars.html