INGREDIENTS
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2 tablespoons unsalted butter
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2 tablespoons dark brown sugar, firmly packed
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1 tablespoon granulated sugar
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1 pinch kosher salt
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1 large egg yolk
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1/8 teaspoon vanilla extract
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1/4 teaspoon baking soda
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1/4 cup all purpose flour
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1/4 cup cocoa powder
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1/2 teaspoon sea salt