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1
For the dough: Combine the melted butter, sugar, salt, baking powder, sour cream and flour in the bowl of a stand mixer or hand-held electric mixer; beat on low speed until a ball forms. Turn the dough out onto a lightly floured work surface and roll in a bit of additional flour, as necessary, to make a soft but manageable dough. Divide into 4 portions, press each into a flattened disk and wrap in wax paper. Place them in a large resealable plastic food storage bag; seal and refrigerate for at least 1 hour.
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2
When ready to bake, preheat the oven to 350 degrees. Stack 2 large baking sheets together and line the top sheet with parchment paper. You will need to repeat this procedure for each batch.
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3
For the filling: Roll out each portion of dough into a 12-inch circle on a well-floured work surface. Smear on the jam, covering the surface of the dough, and then evenly sprinkle on the brown sugar, cinnamon, nuts, if using, and raisins. (TIP: I CUT THE PIECES FIRST AND THEN SPREAD THE FILLING INGREDIENTS ON THEM INDIVIDUALLY, WHICH I FOUND REDUCES MESSINESS. EITHER METHOD WORKS, THOUGH.) Use a pastry or pizza wheel to cut the dough into 12 wedges. Roll up each wedge snugly and place on the lined baking sheet.
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4
For assembly: Whisk together the egg and sugar in a small bowl; brush the rugelach with the egg wash. Bake for 25 to 30 minutes, until the pastries are nicely browned. Transfer to a wire rack to cool completely, then dust with confectioners' sugar, if desired.
