INGREDIENTS
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Brownies
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3/4 cup / 170 grams unsalted butter, plus more for the pan3 ounces / 90 grams bittersweet chocolate, chopped11/2 cups / 300 grams granulated sugar1 tablespoon vanilla extract3 eggs3/4 teaspoon kosher salt1/2 teaspoon instant espresso powder (optional
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Frosting
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6 tablespoons / 85 grams unsalted butter, at room temperature3/4 cup / 100 grams smooth peanut butter1/3 cup / 40 grams confectioners’ sugar1/2 teaspoon flake salt