Preheat the oven to 350ºF.
Line a 9-inch loaf pan with parchment then grease the parchment paper with cooking spray.
In a large bowl, whisk together the flour, sugar, baking soda and salt. Set it aside.
In a separate medium bowl, whisk together the mashed bananas, buttermilk, eggs, melted butter, vanilla extract and peanut butter until well combined.
Lightly fold the banana mixture into the dry ingredients with a rubber spatula just until combined. (The batter will be thick and chunky.) Stir in the peanut butter chips then scrape the batter into the prepared loaf pan.
Bake the bread for 55 minutes or until a toothpick inserted comes out clean.
Allow the loaf to cool in the pan for 5 minutes then transfer it to a cooling rack to cool completely. Slice and serve the bread or store it, wrapped securely in plastic wrap at room temperature or in the fridge.
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