Instructions:

First, prepare the dough: In a saucepan, combine the milk, sugar, and salt, stirring until the sugar is fully dissolved. Then, add the butter and heat over medium-low until it melts. Turn off the heat as soon as it starts to boil. Next, add the flour all at once and stir quickly with a wooden spoon until the mixture forms a smooth dough. Keep stirring until the dough forms a ball that pulls away from the sides of the pan.

After that, transfer the dough to a bowl and spread it out slightly to cool faster. Shortly after, beat the egg in a separate bowl and add half to the dough, mixing vigorously until incorporated. Add the remaining half and mix until the dough becomes soft and smooth.

To shape and bake the balls, transfer the dough to a piping bag and pipe small portions onto a glass baking dish or a baking sheet lined with parchment paper. Wet your fingers with water to smooth any peaks, if needed. Preheat the oven to 356 °F (180 °C). Finally, bake for 10 minutes at this temperature, then reduce to 320 °F (160 °C) and bake for another 10 minutes or until the balls are lightly golden and hollow inside.

To finish, serve the balls warm or at room temperature. For an extra treat, dip them in Nutella or your favorite spread. These are perfect for parties or special occasions like Christmas!