Preparation Steps

• Preheat the oven to 350°F (175°C) and line a muffin tin with paper liners.
• In a bowl, whisk together the flour, baking soda, baking powder, salt, and cinnamon.
• In a separate large bowl, cream together the butter and sugar until light and fluffy.
• Beat in the eggs one at a time, mixing well after each addition.
• Stir in the mashed bananas and vanilla extract.
• Gradually add the dry ingredients to the banana mixture, mixing until just combined. Fold in the walnuts if using.
• Divide the batter evenly among the muffin cups, filling each about three-quarters full.
• Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
• Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.