Uncover the dough and punch it in the middle to deflate.
Transfer the dough to a flat surface and use a rolling pin to flatten it into about 12-inch x 9-inch in size --- it's completely fine if the shape is not perfect.
Scatter most of the chocolate chips (leave 2 tablespoons for later) on top of the dough.
Roll the chocolate buns dough into a log, starting from the longer end, then divide it into 12 equal portions.
Form each portion into a roll, then place it on top of a baking tray lined with a baking sheet. Make sure you leave enough space between each bun.
Place the remaining chocolate chips on top of each bun.
Cover the chocolate chip buns with the kitchen towel and set aside for at least 30 minutes, just enough time for the dough to puff up a bit.
When the chocolate bread rolls are almost ready, preheat your oven to 180°C (350°F).
Prepare the egg wash by combining the remaining egg with two tablespoons of milk.
Uncover the chocolate chip buns and brush each one with the egg wash.
Place the chocolate buns in the middle of the oven for about 25 to 30 minutes, or until they turned golden.
Set aside for at least 10 minutes to cool, then serve.