INGREDIENTS
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1 1/2 cup brown sugar (unpacked, divided)
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1 cup flour
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1/4 cup + 3 tablespoons unsweetened cocoa powder (divided)
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2 teaspoons baking powder
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1 teaspoon salt
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1/2 cup milk
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4 tablespoons melted butter (divided)
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2 teaspoons vanilla (divided)
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1/4 cup white sugar (divided)
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1 3/4 cups boiling water
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1/4 cup light corn syrup
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1/2 cup peanut butter