Mix sugar,butter, molasses, egg yolk, and vanilla. then when mixed well add flour and 1 cup of chocolate chips. Press dough in ungreased 13x9 pan. Bake in 350 degree oven til golden brown 25-30 minutes.
Mix remaining chocolate chips, raisins, peanuts, and peanut butter in a 2 quart saucepan. Heat over medium - low heat stirring constantly, til chocolate is melted. Spread over crust in pan. Rrfrigerate at least 2 hours. Cut into bars.