Rocky Road Fudge Bars

Base  ½ cup butter ¼ cup semi sweet chocolate chips 1 cup all purpose flour 1 cup white sugar 1 tsp. baking powder 1 tsp. vanilla 2 eggs, beaten ¾ cup chopped nuts (your choice) Filling 6 oz cream cheese 1/4 cup butter 1/2 cup white sugar 2 tbsps. all purpose flour...