Warm Molten-centred chocolate cupcakes

I always liked this one... Ah...  the melted chocolate inside...!!

Ingredients:

• 4 tbsp margarine
• 55 grans caster sugar
• 1 large egg
• 85 grams self raising flour
• 1 tbsp cocoa powder
• 55 grams plain chocolate
• icing sugar for dusting

Method:

1. Put 8 paper baking cases in a muffin pan.
2. Put the margarine, sugar, egg, flour and cocoa in a large bowl and, using an electric hand whisk, beat together until just smooth.
3. Spoon half of the mixture into the paper cases. Using a teaspoon, make an indentation in the center of each cake. 
4. Break the chocolate evenly into 8 squares and place a piece in each indentation, then spoon the remaining cake mixture on top. 
5. Bake the cupcakes in a preheated oven, 190C/375F, for 20 minutes or until well risen and springy to the touch. 
6. Leave the cupcakes for 2-3 minutes before serving warm, dusted with sifted icing sugar.

Again this recipe is from my favourite book ....Everyday muffins & bakes. Please do write to me how it turned out..... !!!