300²µ/10½´Ç³ú blueberries, plus extra to serve
1 tsp baking powder
½ tsp ground cinnamon (optional)
pinch of ground cinnamon
450g/1lb self-raising flour
4 tbsp maple syrup
small pinch salt
1 tsp vanilla extract, or seeds scraped from 1 vanilla pod
50²µ/1¾´Ç³ú butter, melted, plus a small knob for frying
150²µ/5½´Ç³ú butter, softened
600ml/20fl oz buttermilk
3 large free-range eggs, separated