Preheat the oven to 350 degrees. Spray a six muffin pan with nonstick spray or line it with cupcake liners. Set aside.
Whisk together the flour, baking soda, and salt in a large bowl. Set aside.
1 1/4 cup All Purpose Flour, 1 teaspoon Baking Soda, 1/2 teaspoon Salt
In a medium bowl, whisk together softened butter, sugar, eggs, mashed bananas, and vanilla
1/2 cup butter, 1 cup Sugar, 2 Eggs, 1 teaspoon Vanilla, 3 Bananas
Add the dry ingredients to the wet ingredients and mix with a wooden spoon until all ingredients are incorporated.
Mix in the walnuts, saving about 1/4 cup for the tops of the muffins.
1 cup Chopped Walnuts
Spoon the banana mixture evenly into each cup or liner. Sprinkle extra walnuts onto the top of the batter.
Bake for 17-20 minutes in a hot oven until the tops are golden brown and a fork or toothpick stuck into one of the muffins comes out clean. Place the muffins on a wire rack to cool slightly before serving.