Preheat and Prep: Preheat your oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan. This prevents the banana bread from sticking.
Combine Dry Ingredients: In a medium bowl, whisk together the all-purpose flour, baking soda, and salt. Set aside.
Cream Butter and Sugar: In a large bowl, use an electric mixer to cream the softened butter and brown sugar together until light and fluffy, about 2-3 minutes.
Add Wet Ingredients: Beat in the eggs one at a time, then stir in the vanilla extract and the mashed bananas. Mix until well combined.
Combine Wet and Dry: Gradually add the dry ingredients to the wet ingredients. Mix on low speed or by hand with a spatula just until combined. Do not overmix; a few lumps are okay.
Bake the Bread: Pour the batter into the prepared loaf pan and spread evenly. Bake for 55-65 minutes. To know when the banana bread is done, insert a toothpick into the center; if it comes out clean or with a few moist crumbs attached, it's ready.
Cool and Serve: Let the banana bread cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. Slice and serve.