INGREDIENTS
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2 sticks unsalted butter, melted and cooled slightly
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 3/4 cup sugar
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1 teaspoon vanilla extract
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1 cup semisweet chocolate chips, melted and cooled slightly
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1 egg
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1 Â 1/2 cups all-purpose flour
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 3/4 cup Dutch-processed cocoa powder
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 1/2 teaspoon kosher salt
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 1/2 teaspoon baking soda
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3 cups confectioners' sugar
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 1/2 cup vegetable shortening
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â
teaspoon kosher salt
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1 teaspoon vanilla extract