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Preheat oven to 350 degrees F
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Grease a 9 x 13 inch pan and then line the bottom of the pan with parchment paper.
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Melt the chocolate and butter in a stainless steel bowl placed over a saucepan of simmering water. Remove from heat and set aside.
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Meanwhile, in a large bowl whisk together the eggs and sugar.
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Fold in the melted chocolate mixture and vanilla extract.
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In a separate bowl, whisk together the flour, baking powder, and salt and then fold into the chocolate and sugar mixture until well combined.
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Pour into the prepared pan and bake for about 45 - 55 minutes, or until a toothpick inserted in the center comes out clean.
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Remove from oven and let cool on a wire rack.