Lightly coat a 8" or 9” springform pan with nonstick cooking spray. Set aside.
Add the wheat flour, all-purpose flour, yeast, sugar, salt to the food processor bowl and combine. Add the warm milk, butter and combine till it forms a dough.
Transfer the dough to a well-floured surface and knead for 5 minutes or until the dough springs back when you gently press your finger into it.
Cover the dough with cling warp and let it rest in a warm place for 30 minutes.
To make the filling, melt the butter and chocolate in a microwave safe bowl. Once cool, add the brown sugar, cocoa powder, cinnamon and combine.
On a well-floured surface, roll the dough into a 16x10” rectangle. Spread the chocolate-cinnamon mixture, leaving a 1” border on the two longer sides.
Carefully roll up the dough into a log, starting at one long edge and rolling towards the other one. Pinch the free end onto the roll to seal.
Slice into 12 pieces using a sharp knife. Place the rolls in the springform pan, and cover with a cling wrap. Keep in a warm place for 30-45 minutes or until doubled in size.
Preheat the oven to 180 C | 350 F. Bake for 17-20 minutes or until the filling is bubbling and the sides feel firm. Cool in the pan for at least 10 minutes.