Chocolate Chip Blondies

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