<human>:  How do I make banana bread?
<bot>: To make banana bread, you will need the following ingredients: 3 ripe bananas, 1 cup of all-purpose flour, ½ cup of sugar, 1 teaspoon of baking powder, ½ teaspoon of baking soda, ½ teaspoon of salt, ½ cup of melted butter, ½ cup of chopped nuts (optional), and 1 teaspoon of vanilla extract. Preheat oven to 350°F (175°C). Mash bananas in a bowl until smooth. In a separate bowl, mix together the flour, sugar, baking powder, baking soda, and salt. Add the mashed bananas to the dry ingredients and mix until combined. Add the melted butter and vanilla extract to the banana mixture and stir until combined. Then fold in the chopped nuts, if desired. Grease a 9x5 inch (22x13 cm) loaf pan with butter. Pour the banana bread batter into the greased loaf pan and spread it evenly. Bake in preheated oven at 350°F (175°C) for 55 minutes or until a toothpick inserted into the center of the bread comes out clean. Allow the bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely. Enjoy!