Ingredients
Equipment
Method
Prep and streusel
- Preheat oven to 350°F and grease a 9x5 loaf pan.
- Mix brown sugar, flour, and cinnamon, then cut in cold butter until crumbly.
- Stir in pecans if using and set the streusel aside.
Make the banana batter
- Beat softened butter and sugar until fluffy, about 2–3 minutes.
- Add eggs, vanilla extract, and mashed bananas, then mix until smooth.
- Fold in all-purpose flour, baking soda, and salt, alternating with sour cream, until just combined.
Assemble and bake
- Pour half the batter into the prepared pan.
- Sprinkle half the streusel over the batter.
- Pour in the remaining batter and top with the remaining streusel.
- Bake for 60–70 minutes at 350°F until a toothpick comes out clean and the streusel is deeply golden.
Notes
For the cleanest streusel ribbon, scatter streusel evenly so it doesn’t clump—if your cold butter is too soft, chill the crumb mixture for 5–10 minutes. Store covered at room temperature up to 3 days or refrigerate up to 5 days; freeze slices up to 2 months. For a lighter dairy swap, use plain Greek yogurt in place of sour cream (same amount).
