preheat oven to 350* line 9 inch square pan with foil & spray with Pam

chop chocolate and melt with butter & cocoa powder in microwave on high, stir & set aside

place sugar & salt in medium bowl, add chocolate mixture & stir together. mix in one egg at a time & vanilla. sift in flour & baking powder, mix well

spread batter into pan, bake for 30 minutes & remove from oven

sprinkle chocolate chips over top & return to oven for one minute, remove from oven & let sit

use foil to remove brownies from pan & spread chocolate over top for marbled effect. let cool completely before cutting into bars