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Preheat the oven to 170c degrees and grease the pan.
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In a bowl, put chocolate and butter and melt together in a microwave or over a double boiler until everything is melted and the mixture is uniform.
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Add salt, sugar and vanilla and mix well until combined.
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Add the eggs one by one, while mixing between additions.
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Add cornstarch and baking powder and mix until you get a smooth, thick batter.
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Pour the batter into the pan and bake for 20-25 minutes or until the cake is swollen and set and a skewer inserted in the center comes out with moist crumbs.
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Cool completely at room temperature.