Mix all the dry ingredients (bread flour, instant yeast, sugar, cocoa powder, salt) in the bowl of the stand mixer.
Add the mashed bananas.
Start to knead the dough at a low setting (speed 2), and add water. *For this recipe, I used ½ cup water, but more or less water (or flour) may be needed depending on the protein content of the flour, the water content in the bananas, as well as the humidity and temperature of the kitchen. Be sure to add one tablespoon at a time, just until the dry ingredients are no longer visible. Add the olive oil and continue to knead for about 8 to 10 minutes. The dough will appear sticky, but will be less so as the flour becomes fully hydrated.
Let the dough rest in the bowl for 10 minutes so that the flour has a chance to absorb the extra moisture.
Remove the finished dough from the mixer bowl and place in a lightly greased bowl.
Let rise until doubled, about 60-90 minutes**
While the dough rises, prepare the filling by mixing the sugar, cinnamon, and mini chocolate chips. Set aside.
If the dough is ready, punch down the dough then remove from bowl. Place on a generously floured surface and use a rolling pin to flatten the dough into a rectangle, about 18 x 10 inches in size.
Spray, brush or sprinkle water or almond milk onto the surface of the dough. Note: the surface just needs to be wet enough for the sugar mixture to stick. Spread the filling mixture over the dough
Starting from the end, roll the dough into a roll. Pinch the seams to seal.
Use a string or dental floss to cut the rolled up dough into individual rolls. For wider, dome-shaped rolls like the ones in the photos, cut into 16 rolls and arrange them 1 inch apart, on a half-sized (8"x13") sheet pan. For regular tall cinnamon rolls with straight sides, cut into 12 rolls and use a 9" x 12" rectangular pan, or a quarter sheet pan, half an inch apart. Line a baking pan of choice with parchment paper.
Place the individual rolls on a parchment-lined baking pan, swirl side up.
Let the rolls rise again for about 30 minutes until puffy. Toward the end of the rise time, preheat the oven to 350F / 180C
Bake the rolls for 15-20 minutes until golden brown
Once cooled enough to handle, frost the rolls with a chocolate frosting of choice. I used this Chocolate Peanut Butter Powder Frosting recipe Enjoy!