01 -
Set your oven to 350°F (175°C). Keep two 8-inch round cake pans ready by greasing and flouring them so the cakes come out clean and bake well.
02 -
Stir together the baking soda, salt, and flour in a medium bowl. Put it aside until needed.
03 -
In a big bowl, use a mixer to blend the softened butter with the sugar. Beat it on medium until it’s fluffy and pale, about 2-3 minutes.
04 -
Add the eggs, one after the other, making sure each one is fully mixed before adding the next. Stir in the vanilla to round out the flavor.
05 -
Pour in the sour cream and add the mashed bananas. Mix until everything’s even and smooth. The bananas add natural sweetness, while the sour cream makes it creamy.
06 -
Slowly add the bowl of dry ingredients into the wet mixture. Stop mixing as soon as it all comes together—don’t overwork it!
07 -
Carefully fold in the white chocolate chips and chopped walnuts. These add crunch and little bursts of sweetness.
08 -
Evenly pour the batter into your prepped pans. Bake for 30 to 35 minutes, or until a toothpick inserted in the center comes out clean. Cool them in their pans for 10 minutes, then move to a rack to cool fully.
09 -
Once cooled, take one cake layer and spread half the custard on it. Add the second layer on top, then spread the remaining custard over the top.
10 -
Top the cake with slices of fresh banana and walnut pieces for decoration. Serve right away or pop it in the fridge until serving time.