"Stacking the dough in alternating colors and then smushing them into a roll is as easy as making shapes with Play-Doh. The method makes for a fancy-looking swirl that novices can succeed at too...."
INGREDIENTS
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2 1/3 cups all-purpose flour, divided
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1 1/2 tsp. kosher salt, divided
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1/3 cup Dutch-process cocoa powder
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1 1/4 cups (2 1/2 sticks) unsalted butter, room temperature
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2/3 cup granulated sugar
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1/4 cup powdered sugar
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1 large egg yolk
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1 tsp. vanilla extract or paste
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1 large egg, beaten to blend
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1/4 cup sanding sugar (any color)