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Preheat oven to 375.
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Set rack to upper third of oven.
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Line a 9x13" baking pan with a large sheet of foil, pressing foil so it fits into the pan.
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Lightly butter foil.
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In a large bowl with electric mixer on high speed, beat eggs, sugar, and vanilla 10 minutes, until blended.
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Meanwhile, in a glass measuring cup, microwave butter and chocolate until almost melted.
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Stir in espresso powder until combined.
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Reduce mixer speed to low. Add chocolate mixture until well blended.
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Mix in flour and salt until just combined.
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Pour batter into prepared pan.
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Bake 25 minutes, until top is shiny and slightly cracked along edges.
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Brownies will be soft and gooey in the middle.
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Do not over bake.
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Transfer to wire rack to cool.
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When completely cool, use foil edges to lift brownies out of pan.
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Cover and let sit at least 4 hours before cutting.