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add cocoa powder and flour. Mix until just blended, Remove dough from bowl and form into a ball. Place the ball of dough on parchment-lined pan,. Roll the dough into a rectangle approximately 6 1/2 inches wide by 11 inches long and 1/4 inch thick. Pierce the suface of dough all over with a fork. This allows air to escape during baking preventing air pockets from forming,)