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