Ingredients
Method
- Whisk flour, baking soda, salt, and 1 tsp cinnamon in a bowl.
- In a large bowl, mash bananas, then whisk in oil, sugars, eggs, sour cream, and vanilla until smooth.
- Stir together the 1/4 cup brown sugar and 1 tbsp cinnamon. Fold dry ingredients into wet until just combined, then layer half the batter into the pan, sprinkle with the cinnamon sugar, top with remaining batter, and swirl 3–4 times with a knife.
- Pour the batter into a greased and parchment-lined 9x5-inch loaf pan and bake at 350°F (175°C) for 55–65 minutes, until a toothpick comes out with a few moist crumbs.
- Cool in the pan for 15 minutes, lift out, and cool completely before slicing.
Notes
The cake tastes even better the next day once the flavors have settled in. For the cleanest slices, let it cool fully before cutting.
