01 - Preheat the oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line with parchment paper.
02 - In a large bowl, mash the bananas until smooth. Add melted butter, eggs, and vanilla extract, then stir until well combined.
03 - In a separate bowl, whisk together all-purpose flour, granulated sugar, baking soda, and salt.
04 - Add the dry ingredients to the wet mixture, folding gently with a spatula until just combined.
05 - Carefully fold in diced strawberries and, if desired, chopped walnuts or pecans, avoiding overmixing.
06 - Pour the batter evenly into the prepared loaf pan.
07 - Bake for 50 to 55 minutes or until a toothpick inserted in the center emerges clean.
08 - Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.