Preheat the oven to 180°C (356°F).
Add eggs, milk, and olive oil to a bowl and mix well.
Add whole wheat flour, cocoa powder, sugar, yeast, and salt, then knead the dough.
Chop dark chocolate into small pieces and mix into the dough.
Place the dough in a loaf pan and let it rise for 1 hour.
Bake in the oven for 30 minutes.
Transfer to a wire rack and let cool completely.