1. Preheat your oven to 350°F (175°C) and line a 9×9-inch baking pan with parchment paper, allowing some overhang for easy removal.
2. In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
3. In a large bowl, combine the melted butter and sugar, whisking until smooth and creamy.
4. Add the egg and vanilla extract to the butter mixture, and whisk until well incorporated.
5. Fold in the mashed bananas, mixing gently until just combined.
6. Gradually add the dry ingredients to the wet ingredients, stirring until no streaks of flour remain.
7. If using, fold in the chopped walnuts for a delightful crunch.
8. Pour the batter into the prepared baking pan, smoothing the top with a spatula.
9. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
10. Allow the bars to cool in the pan for about 10 minutes, then use the parchment overhang to lift them out and let them cool completely on a wire rack before slicing.

Every time I make these, I’m reminded of how the simple act of baking can bring so much joy and connection. It’s a small moment of love that I can share with my family, echoing the traditions I learned from my grandmother.