Brown Sugar Walnut Rugelach

Yield
48 rugelach.
Ingredients
- 2 cups all-purpose flour
- 1 cup unsalted butter, cold and cut into chunks
- 1 cup full-fat sour cream, cold
- 1 large egg yolk
- 2 cups raw walnuts, finely chopped
- ¾ cup packed light brown sugar
- confectioners’ sugar, for dusting
Steps
- Add the flour to a large bowl. Using a pastry cutter, two knives or your fingers, cut the butter into the flour, until it resembles even-sized crumbs. Add in the sour cream and egg yolk. Mix until the dough comes together in large clumps. Form the dough into three equal sized balls. Pat each into a disc and then wrap tightly with plastic wrap. Transfer to the refrigerator and let chill at least 2 hours or even overnight, until well chilled. You want it to be firm enough so that you can roll it out easily.
- Preheat the oven to 350ºF. Line a large baking sheet with parchment paper and set aside.
- In a medium bowl, mix together the walnuts and brown sugar until well combined, making sure to break up any clumps of brown sugar. Set aside.
- Working one ball of dough at a time (keep the other balls in the fridge while you do this), place the chilled dough on a well-floured work surface (I like to do this on well-floured parchment paper). Roll out into a circle that is between ⅛ and ¼ inch in thickness. Sprinkle ⅓ of the walnut / sugar mixture evenly over the dough (all the way to the edges) then press down lightly into the dough. With a pastry or pizza cutter, slice the dough like you would a pizza, into 16 equal triangles. Starting with the wide end, roll up each triangle – some of the filling will fall out – that’s totally fine. Place the shaped cookies on the prepared baking sheet, with the seam side / tip down. Repeat this process with the remaining two balls of dough.
- Bake for about 22 to 24 minutes, until golden brown. Let cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely. If baking in batches, keep any unbaked, shaped cookies in the refrigerator.
- Once completely cool, dust generously with confectioners’ sugar.
Source
http://cookiemonstercooking.com/2014/12/17/grandmas-butter-horns-brown-sugar-walnut-rugelach/