This one's for you David!
Place 12 muffin cases in a muffin tin.
Preheat oven to 170C.
Chop chocolate into rough chunks. Pick over the raspberries.
Sieve flour, baking powder, sugar and salt into a large bowl.
Melt the butter.
Beat milk, butter, yogurt and egg in a jug. Blend well.
Pour milk mixture into flour till well blended into a stiff batter. Stir in the white chocolate chunks and lightly mix in the raspberries, trying not to break them up too much.
Bake for approx. 30 mins or until well risen and golden.