Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
Prepare the Blueberries: If using fresh blueberries, rinse and dry them. Toss them with 1 tablespoon of flour to prevent sinking in the batter.
Mash the Bananas: In a large mixing bowl, mash the bananas until smooth. Leave small chunks if you prefer a bit of texture. Combine Wet Ingredients: Add the melted butter, sugar, eggs, and vanilla extract to the mashed bananas. Mix until fully combined.
Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, and salt.
Combine Wet and Dry Mixtures: Gradually fold the dry ingredients into the wet mixture until just combined. Avoid overmixing to maintain a tender texture. Add Blueberries: Gently fold the blueberries into the batter, ensuring even distribution.
Transfer to Pan: Pour the batter into the prepared loaf pan and spread it evenly.
Bake: Bake for 55–65 minutes, or until a toothpick inserted in the center comes out clean.
Cool: Allow the bread to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.