1. Preheat the oven to 350 degrees F (175 degrees C). Grease 3 mini loaf pans.

2. Mix flour, baking soda, and salt together in a medium bowl.

3. Beat sugar and butter with an electric mixer in a large bowl until light in color and fluffy.

4. Add eggs, one at a time, mixing well after each addition. Stir in vanilla extract; beat in mashed bananas.

5. Add flour mixture a little at a time, beating until just combined into a thick batter. Fold in blueberries until evenly distributed.

6. Pour batter into the prepared loaf pans.

7. Bake in the preheated oven until a toothpick inserted into the center comes out clean, 30 to 35 minutes. Cool in the pans for 10 minutes, then transfer loaves to cool completely on a wire rack.