Chocolate Chip Blondies

1 1/2 cups packed brown sugar

1/2 cup butter, melted

2 large eggs, lightly beaten, room temperature

1 tsp vanilla 

1 1/2 cups all-purpose flour

1/2 tsp baking powder

1/2 tsp salt

1 cup semisweet chocolate chips 

1.  In a large bowl, combine the brow sugar, butter, 

2.  Spread into a greased 13x9 inch baking pan.  Bake at 350 degrees until a toothpick inserted in the center comes out clean, 18-20 minutes.  Cool on a wire rack.  Cut into bars, eggs and vanilla just until blended.  Combine the flour, baking powder and salt; add to brown sugar mixture.  Stir in chocolate chips.