INGREDIENTS
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1 1/2 sticks unsalted butter, melted, plus more for greasing insert
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1 1/2 cups sugar
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2/3 cup unsweetened cocoa powder
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1/3 cup all-purpose flour
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3 large eggs, lightly beaten
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1 teaspoon pure vanilla extract
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Kosher salt
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1/2 cup semisweet chocolate chunks
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Vanilla ice cream, for serving