Preheat the oven: Set to 375°F (190°C). Line a baking sheet with parchment paper for easy cleanup.
Prep the dough: Unroll the crescent dough and separate it into triangles along the perforations. Work on a lightly floured surface if it’s sticky.
Add the filling: Place about 1–2 teaspoons of Nutella near the wide end of each triangle. Don’t overfill—too much can leak out.
Roll it up: Starting from the wide end, roll each triangle toward the tip.
Tuck the sides slightly as you go to help seal in the Nutella. Curve into a crescent if you like, or leave straight for easier dipping later.
Brush with egg wash (optional): Whisk the egg with milk and brush lightly over each roll. Sprinkle with sugar for a little sparkle and crunch.
Bake: Place on the prepared baking sheet, seam-side down, and bake for 10–12 minutes, or until puffed and golden brown.
Cool slightly: Let them rest for 5 minutes.
Dust with powdered sugar if desired.
Serve warm: They’re best enjoyed while the centers are melty.