2.Take the container of electric mixer and blend butter in it by adding sugar in between, until a creamy and light mixture is formed.
3.Also add eggs to the container after whisking well.
4.In a separate bowl, put flour, soda, cocoa and cinnamon and put them on the egg mixture at times with banana.
5.Take muffin pans lined paper and pour batter in it by filling it half.
6.Put the pans in the oven anad bake for 20-25 minutes.
7.Allow the cup cakes to settle at room temperature.