01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan or line with parchment paper.
02 - In a large mixing bowl, mash the bananas until smooth. Stir in melted butter, eggs, and vanilla extract until mixture is blended.
03 - In a separate bowl, whisk together the flour, granulated sugar, baking soda, and salt.
04 - Add the dry ingredients into the wet mixture and fold gently until just combined.
05 - Fold in diced strawberries and, if using, chopped walnuts or pecans. Avoid overmixing to preserve texture.
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 to cool in the pan for 10 minutes, then transfer the loaf to a wire rack to cool completely before slicing.