Ingredients
Method
- Preheat oven to 350°F and prepare loaf pan.
- Whisk flour, baking soda, baking powder, salt, and cinnamon.
- Beat butter and brown sugar until fluffy; add eggs and vanilla.
- Mix in mashed bananas and sour cream.
- Fold in dry ingredients.
- Layer batter and cinnamon sugar swirl; gently swirl.
- Bake 60–70 minutes until toothpick comes out clean.
- Cool before slicing and serving.
