Preheat the oven to 170 deg Fan assisted (160 deg conventional)
Place 12 paper Muffin cases into a muffin tin. You may not need them all.
In a large mixing bowl, mix together the flour, white chocolate drops and sugar.
255 g Self Raising Flour, 100 g white chocolate drops, 170 g soft brown sugar
In a separate bowl, mix together the cooled melted butter, egg, buttermilk, vanilla extract and milk.
115 g butter, 1 egg, 140 g Buttermilk, 1 teaspoon vanilla extract, 4 tablespoons milk
Add the bowl of wet ingredients to the dry ingredients. Give everything a good mix until well combined, ensuring there are no lumps of dry flour.
Using a large spoon or ice-cream scoop, place equal amounts of batter into the Muffin cases to about ¾ full. The muffins will rise a little.
Bake in the oven for 20 - 25 mins, or until baked with a nice golden colour, testing the centre of the Muffins with a skewer until it comes out clean.
Take out of the oven and leave to cool completely.