Ingredients

  • 1 (.25 ounce) package active dry yeast
  • ¼ cup warm water
  • 3 ½ cups bleached all-purpose flour
  • 1 teaspoon salt
  • 1 cup unsalted butter, sliced
  • ¾ cup sour cream
  • 1 large egg
  • 2 large egg yolks
  • 1 teaspoon vanilla extract
  • 1 cup white sugar, or as needed

Directions

  • Sprinkle yeast over warm water in a bowl. Let stand until yeast softens and begins to form a creamy foam while you complete next step.
  • Combine flour and salt in the bowl of a food processor; pulse once or twice to combine. Scatter butter over flour; process until butter is thoroughly mixed into flour mixture, about 1 minute.
  • Whisk activated yeast mixture, sour cream, egg, egg yolks, and vanilla extract together in a bowl; pour into food processor. Pulse several times just until dough starts to hold together and clean sides of the bowl (do not overmix). Transfer dough to a work surface; divide in half. Form each dough half into a thick disk; wrap in plastic wrap and refrigerate at least 2 hours or overnight for the best texture.
  • Preheat the oven to 375 degrees F (190 degrees C). Line several baking sheets with parchment paper.
  • Sprinkle a work surface generously with sugar. Roll out 1 dough disk into an 8x16-inch rectangle; sprinkle dough generously with sugar. Fold dough over in thirds, letter-style. Repeat rolling, sugaring, and folding two more times. Roll out dough into a 4x14-inch rectangle, about 1/4-inch thick. Repeat process with second dough disk.
  • Cut strips from short sides of dough rectangles about 1/2- to 3/4-inch wide. Place strips onto the prepared baking sheets, twisting and slightly stretching strips, or form into horseshoe shapes, if preferred.
  • Bake in the preheated oven until lightly golden brown, 12 to 15 minutes. Cookies will puff up a bit to reveal delicate layers. Let cookies cool for about 5 minutes on baking sheets before transferring to wire racks to cool.

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