INGREDIENTS
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3/4 cup plus 2 tablespoons all-purpose flour
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1/4 cup natural unsweetened cocoa powder
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1/2 tsp. baking soda
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1/2 tsp. kosher salt
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6 Tbsp. (Â 3/4 stick) unsalted butter, room temperature
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1/2 cup sugar
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1 Tbsp. light corn syrup
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1 large egg yolk
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1 tsp. pure vanilla extract
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1 Tbsp. sour cream
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1 pint ice cream (any flavor)