01 - Preheat the oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line with parchment paper for easy removal.
02 - In a large mixing bowl, mash the bananas thoroughly. Add melted butter, eggs, and vanilla extract, then stir until fully incorporated.
03 - In a separate bowl, whisk together flour, granulated sugar, baking soda, and salt until evenly blended.
04 - Gradually add the dry mixture to the wet ingredients, stirring gently until the batter is just combined to avoid overmixing.
05 - Carefully fold in diced strawberries and, if desired, chopped walnuts or pecans. Mix only until the additions are distributed.
06 - Transfer the batter into the prepared loaf pan, spreading evenly.
07 - Bake for 50 to 55 minutes. The loaf is done when a toothpick inserted in the center comes out clean or with just a few moist crumbs.
08 - Allow the bread to cool in the pan for 10 minutes. Unmold and let it cool completely on a wire rack before slicing for best texture.