- 3 very ripe bananas mashed (about 1 1/2 cups)
- 1/3 cup melted unsalted butter
- 3/4 cup granulated sugar
- 1 large egg beaten
- 1 tsp vanilla extract
- 1 tsp baking soda
- Pinch of salt
- 1 1/2 cups all-purpose flour
- 1/2 cup sour cream or plain Greek yogurt
- Optional: 1/2 cup chocolate chips or chopped walnuts