Add the egg and, once fully incorporated, add the vegetable oil. Gradually mix in the flour.

Knead the dough until it becomes less sticky, then shape into balls about 3/4 inch (2 cm) in diameter. Place them on a baking sheet lined with parchment paper. Bake in a preheated oven at 340°F (170°C) for about 20 minutes.

Once baked, remove from the oven and let cool completely. Fill with Nutella as desired.

Serve with a good cup of coffee.