Make the dough

• Warm the milk and dissolve the yeast with a little of the sugar.
• In a bowl combine the flour, remaining sugar and salt, then add the egg, the yeast mixture and the softened butter.
• Knead until the dough is smooth and elastic.

Let the dough rise

• Cover the bowl and leave the dough in a warm place until doubled in size.

Shape and fill the buns

• Divide the dough into equal pieces and flatten each one.
• Place a spoonful of chilled Nutella in the centre and seal the dough around it into a ball.
• Arrange the buns in a buttered baking dish, seam side down.

Second rise

• Cover and let the buns rise again until puffy.

Top and bake

• Brush the buns with the beaten egg and scatter the chocolate chips on top.
• Bake in a preheated oven at 180 °C until golden brown.