01 -
Preheat your oven to 350°F (175°C) and grease two 9-inch round cake pans.
02 -
In a medium bowl, whisk together the flour, baking soda, and salt.
03 -
In a large bowl, beat the softened butter and granulated sugar together until light and fluffy.
04 -
Add the eggs one at a time, beating well after each addition.
05 -
Mix in the sour cream and vanilla extract.
06 -
Stir in the mashed bananas until fully incorporated.
07 -
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
08 -
Fold in the chopped walnuts.
09 -
Divide the batter between the prepared pans and bake for 35-40 minutes, until a toothpick comes out clean.
10 -
Cool cakes completely, then layer with vanilla custard and top with banana slices and walnuts.