Place the buttermilk, water, yeast and sugar into the bowl of an electric stand mixer and stir. Leave to sit for between 5-10 minutes until creamy and foamy.
Add in the melted butter, egg, salt, onion powder and one cup of the flour and mix on medium speed for around 30 seconds.
Scrape down the sides of the bowl then add in the remaining flour.
Beat on low speed for a couple of minutes until the dough starts to pull away from the sides of the bowl.
Continue to mix for a further two minutes.
Grease a bowl then place the dough into the bowl coating all sides of the dough with the oil to prevent sticking. Cover with cling film and place somewhere warm to rise for around 1.5-2 hours until doubled in size.
Grease and flour a loaf tine.
Once risen, deflate the dough then turn it out onto a lightly floured surface.
Roll into a rectangle of approximately 9 x 15 β.
Sprinkle with the cheese leaving a half an inch border all the way round the edge of the dough.
Tightly roll into a log, cut off any rough ends then place into the loaf tin.
Score the top of the loaf then cover with cling film and allow to rest for 30 minutes during which time it will rise a little more again.
Preheat the oven to 350f.
Melt some butter and add in the chopped fresh parsley then brush over the top of the loaf.
Bake for around 45 minutes until golden on top and it sounds hollow when tapped on the underside of the loaf.
If the top of the loaf is becoming too dark, cover with foil.
Cool for ten minutes in the pan then turn onto a wire rack.
I sometimes add cooked and crumbled bacon pieces into this with the cheese which is also delicious!Heats up well in the microwave when a day or two old.