01 - Preheat oven to 350°F (175°C). 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 incorporated.
03 - In a separate bowl, whisk together all-purpose flour, granulated sugar, baking soda, and salt until well blended.
04 - Add dry ingredients to wet mixture and stir gently with a spatula until just combined, avoiding overmixing.
05 - Carefully fold in diced strawberries and, if desired, chopped walnuts or pecans.
06 - Pour batter evenly into the prepared loaf pan, smoothing the surface.
07 - Bake for 50 to 55 minutes or until a toothpick inserted in the center comes out clean.
08 - Allow bread to cool in pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.