CHEWY BROWNIES

¾ cup (180g) salted butter 2 cups dark brown sugar 2 cups dark chocolate chips 3 tbsps. condensed milk 1 cup cocoa powder 4 whole eggs 1 ½ cups all-purpose flour 1 ½ cups coarsely chopped walnuts Grease and line two 8X8X2 square pans, bake at 350F for 30 minutes