In top of double boiler, melt chocolate with oil.
Remove from heat and beat in sugar replacement, eggs and vanilla extract.
Stir in flour, baking powder and salt until well blended.
Pour batter into well greased 8 in. (20 cm) sq. pan.
Bake at 350°F (175°C) for 25 to 30 minutes.
Cut into 2 in. (5 cm) squares.