Preheat your oven to 350°F (175°C). This step is crucial for ensuring even baking.
Grease your loaf pan with a little butter or line it with parchment paper for easy removal.
In a large mixing bowl, cream together the softened butter and brown sugar until light and fluffy. Add in the vanilla extract and eggs, mixing until fully incorporated. Then, fold in the mashed bananas and peanut butter until well combined.
In a separate bowl, whisk together the light spelt flour, baking powder, bicarbonate of soda, and cocoa powder. This helps to evenly distribute the leavening agents.
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Be careful not to overmix, as this can lead to a dense bread.
Fold in the honey, chocolate chips, and any additional sweetener you prefer. If the mixture seems too thick, add warm water one tablespoon at a time until you achieve a smooth batter.
Pour the batter into your prepared loaf pan and smooth the top. Bake in the preheated oven for about 55-65 minutes, or until a toothpick inserted in the center comes out clean.
Once baked, remove the banana bread from the oven and let it cool in the pan for 10 minutes. Then, transfer it to a cooling rack to cool completely. Slice and enjoy your Peanut Butter Chocolate Chip Banana Bread warm or at room temperature.