Mash your bananas in a small bowl and set aside.
In a medium-sized bowl, whisk together the flour, cocoa powder, baking soda and salt. Set aside.
Beat together the butter and sugar. Add the eggs and vanilla and beat. Add the yogurt and mashed banana and beat.
Add the dry ingredients to the wet ingredients and beat on low speed until a batter forms.
Fold in the chocolate chips until incorporated. Pour the batter into your pan and bake for 50-60 minutes.
Let the banana bread cool in the pan, slice and enjoy!