Chocolate bombe

Ingredients 2 tbsp butter, 2 tbsp sugar and 2 tbsp cocoa to line the pudding basins 250g 70% dark vegan chocolate 250g butter 250g plain gluten-free flour 50g cocoa 1/2 tsp gluten free baking powder 4 eggs 250g golden castor sugar 1 good tsp vanilla extract 2 shots espresso 1 filled chocolate egg, about 40g,