Preheat oven to 350°F. Spray a 9×5-inch loaf pan with cooking spray or grease and flour it.
In a large bowl, whisk together egg, light brown sugar, vegetable oil, granulated sugar, sour cream, peanut butter, and vanilla extract.
Add the flour, baking powder, baking soda, and salt. Gently fold with a spatula or stir until just combined.
Fold in mashed bananas and grated apples until evenly distributed.
Gently fold in peanut butter chips.
Pour batter into prepared loaf pan and smooth the top.
Bake for 60 minutes or until a toothpick inserted in the center comes out clean.
Allow bread to cool for 15 minutes in the pan, then transfer to a wire rack to cool completely before slicing.
Optional: serve with additional peanut butter or a drizzle of honey.
Notes
This banana bread variation combines the richness of peanut butter with the freshness of apples and bananas, making it a perfect quick bread for breakfast or snack.