Spray a mini loaf pan with non-stick spray. Set aside.
Combine your flour, baking powder and salt in a medium sized bowl. Sift the ingredients one time.
In a separate bowl combine the butter and sugar together, mix until well combined and creamy.
Add the eggs and beat the mixture until fluffy.
Add the Reese's peanut butter chocolate spread, mix well.
Add your dry ingredients into your wet ingredients slowly, about 1/3 at a time. Mix between additions. Add mashed bananas, chocolate chips and walnuts. Use a wooden spoon and mix by hand, (not with a mixer) just until incorporated.
Pour the mixture into your greased mini loaf pan. They should be about 3/4 full.
Place the pan on the middle rack in the oven. Bake for about 35 to 40 minutes. You want the tops to be golden brown.
Remove the pan from the oven and allow to cool for about 5 minutes.
Invert the pan over a cutting board, and remove loaves carefully. Place them, tops up, on a baking rack to cool.