Preheat the oven to 180 degrees. Grease and flour a small loaf pan and set aside.
Whisk all the dry ingredients in a bowl and set aside.
In another bowl, beat the peanut butter and sugar for a couple of minutes till well mixed.
Add the eggs and the mashed bananas and beat till well combined.
Add in the dry ingredients and fold well till combined.
Finally add the walnuts and chocolate chips and fold gently. Pour into the prepared pan and flatten the top.
Bakes for 60 to 70 minutes till a skewer comes out clean while tested in the center. After 45 minutes, ensure to take out the pan and cover on the top with aluminium foil so that the top does not burn.
Allow to cool in the pan for 10 minutes. Run a knife along the sides of the pan and slowly tip onto a cooling rack. Cool completely before slicing.