Step 1

Preheat the oven to 350° and have ready one standard-sized loaf pan, greased and dusted with flour. See the instructions below if using smaller loaf pans.

Step 2

In a large bowl, cream together butter, sugar, brown sugar, mashed bananas, sour cream, eggs, and vanilla using a handheld mixer or a whisk. Set aside.

Step 3

In a medium-sized mixing bowl, whisk together flour, baking soda, baking powder, and salt.

Step 4

Add the dry ingredients to the wet ingredients and stir until just combined.

Step 5

Add the batter to the loaf pan and bake for 40 minutes. Add a tent of aluminum foil on top of the bread, and bake for 15 minutes longer, or until a cake tester inserted in the center comes out clean.

Step 6

Transfer the banana bread to a cooling rack and allow to cool 15-20 minutes. Then, turn the bread out (if desired), slice, and enjoy!