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Preheat oven to 375*.
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Grease 8" inch round cake pan, and cut 8" parchment or wax paper round to fit inside, grease the top of the paper.
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Microwave chocolate and butter on high one minute at a time until melted.
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Whisk until smooth, then add vanilla, and set aside to cool for a few minutes.
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Add eggs, one at a time and beat well.
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Add splenda, incorporating until melted in.
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Sift in cocoa powder and mix lightly.
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Pour batter into prepared pan and bake in the center of the oven for 20 minutes unil a light crust is formed around the edges.
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Cool on rack for 5 minutes.
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Losen cake around the edges with a knife and invert on serving plate.
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Cool completely before serving.
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Can top with powdered splenda or whipped cream.