01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan or line with parchment paper.
02 - In a large bowl, mash bananas until smooth. Add melted butter, eggs, and vanilla extract, stirring to incorporate.
03 - In a separate bowl, whisk together flour, granulated sugar, baking soda, and salt until evenly combined.
04 - Add dry ingredients to the wet mixture and stir gently until just blended; do not overmix.
05 - Gently fold in diced strawberries and, if desired, chopped walnuts or pecans.
06 - Pour batter into the prepared loaf pan, spreading evenly.
07 - Bake in the center of the oven 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.