1. Preheat oven to 190°C/375°F/Gas 5. Line cupcake tin with paper cases. 2. Put the flour, butter/margarine, sugar, eggs, vanilla and water into a mixing bowl and beat until smooth. 3. Put spoonfuls of dough into base of paper cases. Place a piece of chocolate or drop teaspoons of chocolate spread/nutella on top, then top with another spoonful of dough. 4. Bake for 20-25 minutes until risen and springs back when gently pressed. Cool on a wire tray. 5. When cool, beat icing ingredients together and pipe or spread on top of cupcakes.