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