01 -
In a large bowl, combine flour, sugar, and yeast. Add lukewarm milk, eggs, vanilla extract, and salt. Stir until a dough forms, then gradually incorporate softened butter while kneading until smooth and elastic, approximately 10 minutes.
02 -
Cover the dough and let it rise in a warm place until doubled in size, about 1 to 1.5 hours.
03 -
On a lightly floured surface, roll the dough into a large rectangle. Spread Nutella evenly over the surface, leaving a 1-inch border. If using, sprinkle chopped hazelnuts over the Nutella.
04 -
Roll the dough into a tight log, starting from the long edge. Cut into 12 equal slices.
05 -
Arrange slices in a greased baking dish, cut-side up. Cover and let rise for 30 minutes.
06 -
Preheat oven to 175°C (350°F). Bake the buns for 25-30 minutes until golden brown.
07 -
Whisk together powdered sugar and milk until smooth to create a glaze. Drizzle over the warm buns before serving.