IN A SMALL COMBINE FLOUR, BAKING SODA AND SALT; SET ASIDE. IN A SMALL SAUCEPAN, COMBINE BUTTER, SUGAR AND WATER. BRING JUST TO A BOIL, THEN REMOVE FROM HEAT. ADD 1c CHOCOLATE MORSELS AND VANILLA. STIR UNTIL MORSELS MELT AND MIXTURE IS SMOOTH. TRANSFER TO A LARGE MIXING BOWL. ADD EGGS, 1 AT A TIME BEATING WELL AFTER EACH ADDITION. SLOWLY MIX IN FLOUR MIXTURE. STIR IN REMAINING CHOCOLATE MORSELS. SPREAD IN GREASED 23 cm SQUARE BAKING PAN BAKE AT 325 DEG F. FOR 30-35 MINUTES. COOL COMPLETELY. CUT INTO 6 cm SQUARES. MAKES 16 SERVINGS