Let’s get baking! Follow these simple steps, and you’ll have a delicious banana cake ready in no time:

1. Preheat your oven to 350°F (175°C). Grease and flour a 9×13 inch baking pan.
2. In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
3. In a large bowl, cream together the butter and sugar until light and fluffy, about 3-4 minutes. This step is key, so take your time.
4. Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in the vanilla extract.
5. Mix in the mashed bananas and sour cream until well combined.
6. Gradually add the dry ingredients to the banana mixture, stirring just until combined. Be careful not to overmix, as this can make your cake dense.
7. Fold in the chopped walnuts if using. Pour the batter into the prepared pan.
8. Bake in the preheated oven for 45-50 minutes, or until a toothpick inserted into the center comes out clean.
9. Allow the cake to cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely.

This cake is best enjoyed with a sense of accomplishment and a cup of tea or coffee!