Not sure where I got this from, so I can't give proper credit and I didn't confirm the carb count, but maybe this is something like what you're looking for:

1/2 cup water
1/4 teaspoon salt
1 cup Splenda® (or mixture of 3/4 Splenda / 1/4 Cyclamate Granular)
8 ounces unsweetened chocolate
1 cup unsalted butter
6 eggs
boiling water

Preheat oven to 300°F. Grease one 10 inch round cake pan and set aside.

In a small saucepan over medium heat, combine the water, salt and Splenda. Stir until completely dissolved and set aside.

Either in the top half of a double boiler or in microwave, melt the chocolate. Pour the chocolate into the bowl of an electric mixer.

Cut the butter into pieces and beat the butter into the chocolate –– one piece at a time. Beat in the sweetened water. Slowly beat in the eggs –– one at a time. Pour the batter into the prepared pan. Have a pan larger than the cake pan ready, put the cake pan in the larger pan and fill the pan with boiling water halfway up the sides of the cake pan.

Bake cake in the water bath at 300°F for 45 minutes. The center will still look wet. Chill cake overnight in the pan. To unmold, dip the bottom of the cake pan in hot water for 10 seconds and invert onto a serving plate.

Serves 10 - 4 grams per serving, after fiber reduction.

(I haven't tried this yet but I might add some almond flour to it to give it more body (cakiness) and less egginess. It's very similar to the french silk recipe, only it's baked.)

hth,
Pokey One