Dark Chocolate(50%+): 100g~120g， Butter: 80g， Full Egg: 2， Banana: 1， Cake Flour: 50g~60g， Baking Powder: 5g， CocoaPowder~Optional: 5g~10g， Sugar: As much as you like
1put the butter and chocolate together and melt them till they become liquid
2put the the beaten eggs into "1"
3Use the dressing sieve to put those flour and powder into "2" within several times, make sure they melt well into "2"
4slice the banana and put them into "3", better keep the banana stay into it,not on top of it
5pre-heat the oven to 180℃，and then put "4" into the oven and keep it heated in the temperature of 180℃ for 25mins
6after that continue heating in the temperature of 150℃ for another 15mins
7All Done
Don't use too much flour if you want it to be soft enough