01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan or line with parchment paper.
02 - In a large mixing bowl, mash bananas until smooth. Add melted butter, eggs, and vanilla extract, stirring until fully integrated.
03 - In a separate bowl, whisk together all-purpose flour, granulated sugar, baking soda, and salt until evenly blended.
04 - Incorporate the dry mixture into the wet ingredients, blending gently until just combined without overmixing.
05 - Fold in diced strawberries and, if desired, chopped walnuts or pecans, maintaining a delicate mix to avoid crushing the fruit.
06 - Transfer batter into the prepared loaf pan, evening the surface for uniform baking.
07 - Place in oven and bake for 50 to 55 minutes, or until a toothpick inserted in the center emerges clean.
08 - Remove from oven and let cool in pan for 10 minutes. Turn out onto a wire rack to cool completely before slicing.