Heat buttermilk, water and butter until the butter melts.
In a shallow bowl, place sugar. Pour hot liquid over sugar and stir until sugar melts. Let liquid cool to 120 – 125 F.
Sprinkle yeast on top and leave for 5 minutes until it turns foamy.
In the bowl of an electric mixer, combine flour, salt, scallions and cheese.
Add yeast liquid and knead for about 10 minutes, adding an extra ½ cup of flour as necessary.
Place in a lightly greased bowl. Cover with plastic wrap and a kitchen towel. Leave it to rise until doubled in size, about 1 hour.
Place a piece of parchment paper on a cookie sheet. Spray with non stick spray.
Divide dough into 8 portions. Roll into 8 balls and flatten then a bit by pressing down.
Cover with a clean kitchen towel and leave to rise for about 15 minutes, until they look almost doubled in size. Press down a little again with your hands. Leave to rise another 20 minutes.
Preheat oven to 350 F.
Brush the top with milk.
Bake for 30 minutes, until golden brown.