These are way too tasty to make often! The batter is the best bit in my opinion, tho it is still heavenly when cooked. This might not seem very sweet to most people, but to us it is plenty sweet enough with just 1/2 cup of sugar. You will probably want to try it out with more the first time. If you don't like banana leave it out and increase the sugar - up to 1 1/2 cups if you have a sweet tooth.
1 mashed banana
1/2 - 1 cup muscovado (or other unprocessed) sugar
3/4 cup flour
1/2 cup cocoa
1 tsp baking powder
170g melted butter
Preheat oven to gas mark 4. Line or grease a baking tin (I use an 8" cake tin for this). Mix together the eggs, banana and sugar. Add the flour, cocoa, baking powder and butter. Stir, but not too much - about 30 strokes should do it. If you like chopped nuts and/or chocolate chips in your brownie fold them in now. Pour into your tin and bake.