In a large mixing bowl (or bowl of a stand mixer), sprinkle the yeast over the barely warm milk and melted butter and allow to sit about 5-10 minutes until activated (looks frothy). Mix in the espresso powder, sugar, and egg. Gradually add in the flour, mixing until the dough comes together. If the dough is too dry and will not come together, add small amounts of water until it does. Conversely, if the dough is too sticky, add flour until it becomes workable; however, do not add too much flour or the bread will become dense.
Turn out the dough on a lightly floured surface and knead the dough for 7-10 minutes, or until elastic. Alternatively, using the dough hook on a stand mixer, knead the dough for 7-10 minutes, or until elastic. Cover dough with plastic wrap or a kitchen towel and let rise until doubled in a warm place, about 2 hours.
1/4 cup (50 grams) brown sugar, packed
1 teaspoon espresso powder
1/2 cup (150 grams) nutella
In a small bowl, mix together the brown sugar and espresso powder.
On a lightly floured surface, roll out the dough to 11 by 15 inch rectangle. Spread the dough evenly with the nutella, leaving a 1/2-inch border around the edges Sprinkle on the brown sugar mixture. From the longer end, roll the dough very tightly until it forms a log. Cut off the ends of the dough and cut the log into 1 1/2-inch segments.
Place the rolls into a 10-inch round pan. Cover and allow the dough to rise until it doubles in size, about 45 minutes to 1 hour. Alternatively, you can also make the rolls the night before and allow them to double in size in the refrigerator overnight.
Preheat the oven to 375 degrees F (190 F). Bake for 15-20 minutes, or until the tops are golden. Serve hot.