01 - Preheat oven to 350°F. Thoroughly grease a 9x5-inch loaf pan or line with parchment paper.
02 - In a large mixing bowl, mash the bananas until completely smooth. Add melted unsalted butter, eggs, and vanilla extract, and stir until fully incorporated.
03 - In a separate bowl, whisk together all-purpose flour, granulated sugar, baking soda, and salt until homogenous.
04 - Add the dry mixture to the wet ingredients, stirring gently by hand until just combined to maintain tenderness.
05 - Carefully fold diced strawberries and, if desired, chopped nuts into the batter. Avoid overmixing, which may impact texture.
06 - Spread 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 bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.