In a mixing bowl add the bread flour, cacao powder, salt, quick yeast, caster sugar, and mix them well. Next add water and milk then mix well. Once the dough has gathered together, turn it out onto the work surface.
Start to knead the dough for 5 minutes or until the gluten has formed.
Next spread the dough and add the unsalted butter, cover with the dough then start to knead it again for around 10 minutes or until it become smooth. Cut a piece of dough and spread it very thin, if you can see your finger though the dough, and it does not break easily, this means the gluten is ready.
Roll the dough into a ball and put it back to the mixing bowl and cover with wrap. Leave the dough in a warm place to do the first ferment for 40 to 50 minutes or doubled in size.
Dust your finger with flour, and gently poke it into the dough, if the dough retains the finger hole when you pull your finger away, it is fermented enough.
If your dough is sticky, dust some bread flour on the surface, turn it out onto the work surface use your hand gentle push the air out and divide into 20 equal pieces. Next shape each piece into a small ball, then leave them to rest for 15 minutes, cover with wrap.
After 15 minutes, put the dough on the surface the smooth side on the bottom, push the air out gently and push whole edge thiner then add a Reese's mini cup to the middle of the dough and seal it and roll each dough into ball again.
Place the balls onto a baking tray, give them space to grow. Then leave them to do a final ferment for 30 - 40 minutes or until doubled in size in the warm place and cover with warp.
Preheat the oven to 200°C(392°F)
Once the dough is proved, dust with some cocoa powder on the top of the bread. Then put them into the oven and bake in 180°C(356°F) for 15 minutes.
Once you have removed the bread from the oven, give the tray a gentle tap on the work surface. This will allow any extra steam or moisture to escape and stop it being trapped inside.
Enjoy your bread.