INGREDIENTS
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10 tablespoons (1 1/4 sticks) unsalted butter
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1 1/4 cups sugar
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3/4 cup plus 2 Tbsp unsweetened cocoa (natural or Dutch-process)
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1/4 teaspoon salt
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1 teaspoon vanilla extract
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2 large eggs, cold
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1/2 cup all-purpose flour
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1 pint vanilla ice cream or chocolate
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1/2 cup smooth or chunky peanut butter