All ingredients ready? Let's begin!
Preheat oven to 350 and grease and flour a 9x13 loaf pan.
Sift flour, cocoa powder, baking soda, and salt in a medium bowl and set aside. In a large bowl, cream butter and sugar until fluffy. Add bananas and combine.
Crack eggs in and whisk them with the fork, then mix them into the banana cream. Beat well until creamy. Add vanilla extract and ground cinnamon now, if using.
With a large wooden spoon, incorporate flour mixture into the wet ingredients, in 2 to 3 parts. Mix until just combined, don’t over-mix.
Add chocolate chips and mix until combined.
Bake for about 50 minutes or until a pick comes out clean (that is, with no batter on it, there may be melted chocolate and crumbs).
Let it cool for 10 minutes before cutting into squares and serving. Enjoy!