PREHEAT oven to 350º F.
BEAT peanut butter and butter in large mixer bowl until smooth. Beat in sugar, eggs and vanilla extract. Beat in flour and salt. Stir in 3/4 cup morsels. Spread into ungreased 13 x 9-inch baking pan.
BAKE for 25 to 30 minutes or until edges are lightly browned. Sprinkle with remaining morsels. Let stand for 5 minutes or until morsels are shiny; spread evenly. Cool completely in pan on wire rack. Cut into bars.