Preheat the oven to 180C/350F degrees
In a bowl mix the dry ingredients.
Add the melted butter and stir well
Add the egg whites and apple cider vinegar and continue to mix.
Gradually add the boiling water until you have a dough.
Roll the mixture into six buns. I rolled mine long, but you could have rounder shapes if you wanted
Place the rolls on a parchment paper lined baking tray
Bake for 30 minutes until the bottom of the rolls are firm.
Remove from the oven and allow to cool enough to handle
Mix the butter and garlic together
Slice the rolls in half length ways and spread the butter on each half.
Place the bread roll halves back on the baking tray and sprinkle with the grated cheese.
Bake for 10-15 minutes at 220C/410F degrees until the cheese has melted.