Whisk the flour, cocoa powder, baking soda, and salt together in a bowl and set aside.
Mash the bananas with a fork, and mix in the melted butter until combined. Add the brown sugar, egg and vanilla. Mix well.
Mix the dry ingredients into the wet, just until combined. Stir in the chocolate chips, leaving a handful out to sprinkle on top.
Pour batter into greased pan and sprinkle chocolate chips on top. Bake for 55 minutes, or until a toothpick comes out clean. Just make sure it's not melted chocolate chip you're seeing when judging for readiness. Oven times will vary.
Remove from oven and let it cool for 15 minutes or more before cutting.
Notes
Recipe Variations
This recipe doesn't need any improvement but I did imagine how yummy AND pretty it would be if I swirled peanut butter in the top before baking. Try that if you're a peanut butter lover and let me know how it is!You could also have fun with the chocolate chips, and use peanut butter ones or even butterscotch ones.