Puff Pastry Chocolate-Hazelnut Rugelach

"Consider these the ultimate pantry cookie: all you really need to buy would be puff pastry and a jar of Nutella and you’re a few steps away from the easiest rugelach ever. Look for puff pastry made with all butter (many are cut with shortening). They can cost a little bit more but that pure butter flavor is worth the price. Puff pastry tends to defrost best on the counter at room temperature but if you’re not sure when you’ll get around to baking you may want to stick it in the fridge to defrost overnight. If at any point during preparation, the pastry gets too soft, stick it back in the fridge to firm up before proceeding...."