Chocolate Banana Loaf

100g butter
100g dark chocolate
50g dark brown soft sugar
50g golden caster sugar
2 eggs
2 big bananas or 4 smaller ones
250g self-raising flour

1. Grease a loaf tin and preheat oven to 180C
2. Mash bananas in a bowl, with a fork.
3. Melt chocolate in another bowl.
4. Cream butter and two types of sugar together in yet another bowl. Beat in the eggs.
5. Pour banana sludge and melted chocolate into the bowl with the butter-sugar-egg mix, and mix thoroughly.
6. Bake at 180C for 20 mins, then reduce oven temperature to 120, continue baking for another half an hour or so (my timing might be off, I cannot remember how long I baked for) until a skewer pushed into the loaf comes out clean. If the top begins to colour too much, cover with foil after 30 minutes.