Place the plain flour, sea salt, sugar and dried yeast into a bowl and mix well. Pour in the lukewarm milk and mix until a soft dough forms. Cover and leave to prove at room temperature for 1 hour, or until doubled in size.
After one hour, knock back the dough gently, cover again and leave to rest for 20 minutes.
Mix the sugar and cinnamon powder together.
Lightly oil your hands with vegetable oil, then divide the dough into 6 equal portions.
Flatten each piece of dough in your hand. Add a spoonful of blueberries to the centre, then gather the edges and seal.
Heat a pan over a medium heat and add a thin layer of vegetable oil.
Place the dough balls into the pan and cook for 1 minute until lightly golden underneath.
Turn over and gently flatten with a spatula. Cook for another 1 minute until golden brown.
Turn once more, reduce the heat to low, cover with a lid and cook for 1 minute.
Remove to a tray and dust generously with cinnamon sugar.
Bring a small saucepan of water to a simmer. Place a heat-proof bowl on top and add chocolate, cream and butter to teh bowl. Stir until melted, then drizzle over the pancakes and serve.