In a blender in this order combine melted butter, eggs, bananas, sour cream, vanilla extract, and sugar. Pulse the mixture until just blended, about 4 pulses.
1/2 cup unsalted butter, 2 large eggs, 2 medium bananas, 1/3 cup sour cream, 2 teaspoons vanilla extract, 1 cup granulated sugar
Add all the dry ingredients to the blender. Pulse an additional 4-5 times or until the mixture is just combined. Be careful not to overblend, as it can result in a dry and dense banana bread.
1/2 teaspoon sea salt, 1/2 teaspoon baking soda, 1 teaspoon baking powder, 1 1/2 cups all-purpose flour
Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius). Grease a 9x5 loaf pan or line it with parchment paper.
Pour the batter into the prepared loaf pan.
Bake for 45 minutes. Then, loosely cover the bread with foil and bake for an additional 15 minutes or until a toothpick inserted into the center comes out clean.
Allow the banana bread to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.