With a soft and tender crumb, sweet banana flavor, and toasted walnuts folded throughout, this banana bread is the perfect recipe to use up those ripe bananas!
Preheat the oven to 350℉. Grease and line a 9x5 loaf pan with parchment paper and set aside (see note).
In a medium-sized bowl, whisk together the flour, cornstarch, baking soda, baking powder, cinnamon, and salt. Set aside.
In a large bowl, whisk together the melted butter and sugar until pale-colored and well-combined, around 1-2 minutes. Beat in the eggs, one at a time, followed by the mashed banana, sour cream, and vanilla.
Fold the dry ingredients and walnuts into the wet ingredients, mixing until everything is hydrated and combined (do not overmix!). Pour the batter into the prepared pan.
Bake the banana bread for 50-60 minutes, until golden-brown on top and a toothpick inserted comes out clean.
Let the bread cool in the pan for at least 15 minutes before turning out and serving!
Notes
*If desired, you can toast the chopped walnuts as you prepare the batter. Bake them until golden-brown and fragrant, around 10 minutes (be sure to check them so they don't burn).