In a large bowl, combine 1 cup of flour, cocoa powder, sugar, instant coffee granules, salt, and yeast. Mix well.
In another bowl, whisk together warm milk, melted butter, and egg until smooth.
Gradually add the wet ingredients to the dry mixture, stirring continuously.
Add the remaining flour, a little at a time, until a soft dough forms. Knead the dough on a lightly floured surface for about 5 minutes until it becomes elastic.
Place the dough in a greased bowl, cover with a towel, and let it rise in a warm place for about 1 hour, or until doubled in size.
Once the dough has risen, punch it down to release the air and roll it out into a rectangle (about 12x8 inches).
In a small bowl, mix brown sugar and ground cinnamon. Spread the mixture evenly over the rolled-out dough, then sprinkle the chocolate chips over it.
Starting from one long edge, tightly roll the dough into a log, then slice it into 12 equal pieces.
Place the rolls in a greased baking dish, cover them with a towel, and let them rise again for about 30 minutes.
Preheat your oven to 350°F (175°C). Once the rolls have risen, bake them for 20-25 minutes or until they are golden brown.
While the rolls are baking, prepare the icing by combining powdered sugar, brewed coffee, and milk in a bowl until smooth.
Remove the rolls from the oven and let them cool for a few minutes before drizzling them with the icing.
Notes
Serve the mocha cinnamon rolls warm, drizzled with extra icing if desired, and garnish with a sprinkle of cocoa powder or a few coffee beans for visual appeal.