For the banana chocolate cake, mix butter and sugar in a food processor, add eggs gradually.
Peel bananas, mash and stir in as well. Preheat oven to 175°. Grate chocolate. Mix well with cocoa powder, cinnamon, clove powder, nutmeg, baking soda and baking powder and flour, then add to mixture.
Grease loaf pan and pour in mixture. Bake cake on lowest rack for at least 45 minutes (test with chopsticks). Melt chocolate coating according to instructions.
Let banana chocolate cake cool and cover with chocolate coating.