In a medium-size bowl, add the 1/4 cup butter and confectioners sugar and beat together for about 1 minute.
Add in 1/2 cup flour, 1/4 teaspoon cinnamon, and egg yolk.
Beat until a smooth paste is formed.
Divide the mixture into 6 equal pieces.
Wrap with plastic wrap and set aside.
HOW TO SHAPE ROSCA DE REYES SWEET KINGS BREAD?
When the bread dough has almost doubled in size, punch down to remove air.
With floured hands, remove from bowl and knead a few times then shape into a ball.
Roll dough into a 40–inch long by 2-inch wide log.
Place on a large parchment-lined baking sheet.
Bring ends of the dough together to form a large oval ring.
With wet hands, press to seal ends. Cover with a clean kitchen towel and place the baking sheet in a slightly warm, draft-free place.
Let dough stand for 1-2 hours or until almost doubled in size.
Preheat oven to 350°F.
Beat the remaining egg until well blended.
Brush the bread dough ring with a beaten egg.
Roll pieces of dough strips into 3-inch long by 1 1/2-inch wide strips.
Arrange strips decoratively on the dough ring.
Add strips of candied orange and lemon peel or your preferred candied fruit.
Bake 25 to 35 minutes or until golden brown and dough sounds hollow when tapped.
Cool completely on a wire rack and serve. Enjoy!