INGREDIENTS
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4 ounces (1 stick) butter (plus more for pan)
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5 ounces unsweetened chocolate
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1 cup flour
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1 teaspoon powdered espresso
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1/4 cup Dutch-process cocoa
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1/2 teaspoon kosher salt
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1 cup granulated sugar
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3/4 cups brown sugar
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3 large eggs
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1/2 teaspoon vanilla extract
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Optional ingredients: crushed peppermints (or Altoids), peppermint extract, chocolate chips, cinnamon, nuts, almond extract, orange zest and juice, cardamom, powdered sugar, flaky sea salt