Preheat oven to 350 degrees Fahrenheit
Mash Bananas, baking soda, and buttermilk together, set aside.
Mix together all-purpose flour, baking powder, and salt in another bowl, set aside.
In mixing bowl, beat room temperature butter and brown sugar until well combined.
In butter mixture, add egg.
Next, in butter mixture, add vanilla extract.
Next add banana mixture to your butter/brown sugar mixture.
Beat until you get this consistency.
Stir in flour mixture into butter-banana mixture until well combined. Here I'm putting this in 1/4 cup at a time.
Add chocolate chips, stir in with spatula by hand.
Fill your baking pan, bake for 60-70 minutes and/or until cake tester comes out clean (I used a chopstick).
And voila! You are done :)