Chocolate Rugelach - Once Upon a Chef

Ingredients

• 2½ cups all-purpose flour, spooned into measuring cup and leveled-off
• 6 tablespoons sugar
• Heaping ¼ teaspoon salt
• 1 cup (2 sticks) cold unsalted butter, cut into 1-in chunks
• 6 oz cold cream cheese, cut into 1-in chunks
• 1 egg yolk
• 8 oz semi-sweet chocolate, best quality such as Ghiradelli, roughly chopped
• ½ cup sugar
• ¼ teaspoon salt