PREHEAT oven to 350° F.
COMBINE flour, baking powder and salt in medium bowl. Beat butter, SPLENDA® Brown Sugar Blend and vanilla extract in large mixer bowl until creamy. Beat in eggs. Gradually beat in flour mixture. Stir in 1 cup morsels and nuts. Spread into ungreased 13 x 9-inch baking pan. Sprinkle with remaining morsels.
BAKE for 30 to 40 minutes or until wooden pick inserted in center comes out clean. Cool in pan on wire rack. Cut into bars.