Mix in flour, cinnamon powder, salt, buttermilk, and butter. Stir until the dough starts to come together.
Add the yeast, sugar, vinegar and warm water to the above
Start kneading the dough and knead it until the dough is smooth and elastic, I like to knead it either on the countertop of using the dough hook of my machine. If you use the countertop and knead by hand it will take about 8-10 minutes of kneading. In the machine you need to knead for about 5 minutes.
At the end nicely oil the dough and keep in a bowl, cover the bowl with cling wrap and leave it in a warm place to rise until doubled in size (mine took about an hour and 20 minutes)
Once the dough has risen, punch the dough down and knead again for about 2 minutes, leave it for resting for about 5-10 mins.
Now roll the dough into a rectangle and cut into even strips. (just like we did for the tomato butter and bacon bread)
Spread Nutella on top of the first strip. Spread chopped bananas, Top with second strip and repeat with all the other strips
Cut the layered dough into 12 sections of equal length (if using the normal pan)
Turn each section onto its side and place into a depression in a greased cupcake tin.
Leave the cupcake tin in a warm place and let the dough rise for another hour or so
Preheat oven to 180C.
Bake for 20 minutes or until it begins to brown.