In a large bowl cut the butter into the flour until the mixture clumps together easily. Add in the cream cheese and sugar and continue to cut into the mixture until well incorporated.
Stir in yolks until blended (you can use your hands) then lightly knead and form into a ball; cover and refrigerate for 45 minutes.
Remove chilled dough and equally divide into 6 balls. Working with one ball of dough at a time (refrigerate the rest until needed) roll into an 8-inch circle. Cut circle into 8 slices; place about 1/4 a tsp of nutella onto the widest part of the slice and roll towards the center creating a small crescent.
Place onto a lined baking sheet and keep refrigerated until baking sheet gets full.
Preheat the oven to 385 degrees F and bake for 22-25 minutes or until lightly golden.
Dredge warm cookies into powdered sugar and enjoy.