In a large bowl or a mixing bowl, add 1 tsp sugar, warm milk and active dry yeast. Cover and let that sit for 5-10 minutes until it's frothy.
Gradually add the eggs, flour & salt while mixing. Once the whole flour is added, start kneading with your hands or in a stand mixer for 10-15 minutes. Now, add the butter and continue kneading for another 5-10 minutes, until a smooth dough is formed. It should be sticky, but not sticking in your hands. Cover the dough and let it sit in a warm place for 1 hour or until it's doubled in size.
Punch the dough and drop it in your workface. Add the 150gr of chocolate chips and knead until they're all incorporated and smooth.
Divide the dough into 8 balls and shape them accordingly. Start by taking them one by one, rolling them out and add Nutella in the center. Pinch the ends to keep the Nutella inside and once them on your prepared baking tray. Cover them and allow them to proof for 30 minutes.
In the meantime, preheat your oven at 180c and prepare your egg wash, by adding 1 egg white + 1 tbsp milk in a small bowl.
Once the brioches have doubled in size, brush them with the eggwash and bake them for 20-22 minutes or until golden brown on top.
Once they're out, brush them with unsalted butter and enjoy with a cup of milk, coffee or tea! 💕