INGREDIENTS
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1 1/2 sticks unsalted butter, melted and cooled slightly
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1 1/2 cups sugar
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1 tsp. kosher salt
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3 eggs
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1 cup cocoa powder (Hershey's Special Dark, if possible; its rich flavor is especially suited to gooey brownies)
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1 cup flour
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Canola oil spray
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Vanilla ice cream, optional, for serving