Directions
First of all, preheat the oven at 375ºF. In a bowl, add flour, eggs, baking soda, bananas, butter, sugar, and vanilla extract. Mix everything properly with a hand mixer. Make sure you get a smooth batter. In the end, add the walnuts inside. Now place the muffin tray lined with the muffin cases. With a ladle, fill each muffin case with the batter.