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Preheat oven to 350 degrees F.
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Grease your coffin pan or line a 9X12 inch pan with baking paper and grease the sides.
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Whisk together flour, salt, baking powder, dark cocoa powder, and cayenne pepper and set aside.
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Beat butter and sugar until fluffy (3 minutes).
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Add eggs one at a time until combined.
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Beat in vanilla extract.
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Add the dry ingredients and beat until combined.
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Mix in the chopped chocolate.
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Pour into the pan.
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Bake about 25-30 minutes or until a knife inserted in the brownie comes out clean. If you are baking in a regular pan, bake for 30 minutes.
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Cool completely before decorating.