This is the Mudcake recipe I always use, but I have never made it in to cup cakes, so I don't know how long to cook it for or at what temp. It is our favourite cake I think.

Mississippi Mud Cake

250g butter of margarine
150g dark chocolate (dark cooking choc)
2 cups sugar (i use white sugar)
1 cup hot water
1/3 cup whisky (this is the mississippi part!)
1 tblsp dry instant coffee
1 1/2 cups plain flour
1/4 cup self raising flour
1/4 cup cocoa powder
2 lightly beaten eggs

Grease and line a 23 cm square pan.
Combine butter, chocolate, sugar, water, whisky and coffee in large saucepan over low heat.
Stir in flours and cocoa, then eggs.
(At this point, mine is always full of flour lumps, so I spoon and press the mixture through a strainer, and it turns out beautiful!)
Pour into prepared pan.
Bake in moderate slow oven for approximately 1 1/4 hours (test with skewer).
Stand 10 minutes on wire rack before turning out.
Serve dusted with icing sugar or covered in ganache icing and King Island Cream (the most lusciously thick cream around!). If you have any left over the day after, cut a slice, and microwave it for around 30 seconds. The ganache and cake melt a bit, and its wonderful!