Preheat your oven to 350 F and line a 9 x 13 pan with foil and spray with cooking spray.
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
With an electric mixer, beat the butter and brown sugar until light and fluffy.
Beat in the sour cream until smooth.
Next mix in the eggs, mashed banana, and vanilla.
On low, mix in the dry ingredients.
Fold in the chocolate chips and walnuts.
Pour batter into prepared pan and bake for 30-35 minutes.
Once cake is done, remove from oven and poke holes all over the top of your banana cake. Go crazy!
Pour your salted caramel over top and place in fridge to cool.
Once the cake has cooled, cover in whipped cream, chopped chocolate and caramel.