Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.
Separate the biscuit or crescent dough into individual pieces. Flatten each piece into a small circle using your hands or a rolling pin.
Place about 1 teaspoon of Nutella in the center of each dough circle. Be careful not to overfill.
Bring the edges of the dough up and over the Nutella, pinching tightly to seal. Roll into a smooth ball and place seam-side down on the baking sheet.
Brush each ball with melted butter. Bake for 8–10 minutes, or until golden brown and puffed.
Once out of the oven, brush with additional butter if desired and sprinkle with cinnamon sugar or powdered sugar. Let cool slightly before serving.