Activate the yeast

• Combine the warm milk, sugar and yeast in a bowl.
• Let sit until foamy.

Make the dough

• Add the egg, egg yolk and melted butter, then mix.
• Stir in the salt, bread flour and cocoa powder.
• Mix until a soft dough forms.

Knead the dough

• Knead on a lightly floured surface until smooth and elastic.

First rise

• Place the dough in a lightly greased bowl, cover, and let rise until doubled.

Make the filling

• Mix the butter, brown sugar, Nutella and cinnamon until fully combined and spreadable.

Shape the rolls

• Roll the dough into a large rectangle on a lightly floured surface.
• Spread the filling all over the dough.
• Slice into 8 pieces with a pizza cutter, then roll each piece up tightly (or roll the whole thing tightly and slice).

Second rise

• Place the rolls in a greased 9x13 pan, cover, and let rise.

Bake

• Pour the warm heavy cream over the rolls right before baking.
• Bake at 175 °C until golden and cooked through.

Finish

• Let the rolls cool just slightly, then spread Nutella over the warm rolls.