Ingredients
Method
- Preheat oven to 350°F (175°C). Grease a 9x5-inch loaf pan.
- In a large bowl, whisk melted butter, brown sugar, mashed banana, egg, vanilla, and sour cream until smooth.
- Sprinkle flour, baking soda, salt, and cinnamon over the wet mixture. Stir with a spatula just until no dry streaks remain.
- Fold in toasted walnuts with a few broad strokes.
- Pour batter into the pan, smooth the top, and bake 50 to 60 minutes until a toothpick comes out with moist crumbs.
- Cool in the pan 10 minutes, then turn out onto a wire rack. Slice and serve warm or at room temperature.
Notes
Cool the cake completely before slicing if you want neat, even slices. Store at room temperature for up to 2 days, or in the fridge wrapped tightly for longer freshness. For the best banana flavor, use bananas so ripe the peels are mostly black.
