01 - Combine warm milk and yeast in a small bowl. Allow to sit for 5 minutes until a foamy texture develops.
02 - In a large mixing bowl, whisk together flour, sugar, and salt. Incorporate the activated yeast mixture, melted butter, and eggs. Mix until a soft, cohesive dough is formed.
03 - Knead the dough on a lightly floured surface for 8-10 minutes until it is smooth and elastic. Transfer to a greased bowl, cover, and let rise in a warm place for 1 hour, or until doubled in volume.
04 - In a separate bowl, combine the brown sugar, cocoa powder, and cinnamon.
05 - Gently punch down the risen dough. On a floured surface, roll the dough into a 16x12-inch rectangle. Spread the softened butter evenly over the dough. Sprinkle the prepared sugar-cocoa-cinnamon mixture and the mini chocolate chips over the buttered surface.
06 - Tightly roll the dough from one of the long sides to create a spiral. Cut the log into 12 equal pieces. Arrange the pieces in a buttered 9x13-inch baking dish. Cover and allow to rise for an additional 30 minutes. Preheat your oven to 350°F (175°C).
07 - Bake for 22-25 minutes, or until the rolls are golden brown. Remove from the oven and let cool slightly.
08 - While the rolls are cooling, whisk together the powdered sugar, cocoa powder, milk, and vanilla extract in a small bowl until a smooth glaze forms. Drizzle the glaze generously over the warm rolls.