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, cinnamon, and salt in a large bowl. Set aside.
1 1/4 cup All Purpose Flour, 1 teaspoon Baking Soda, 1/2 teaspoon Salt, 1/2 teaspoon Cinnamon
In a medium bowl, whisk together softened butter, sugar, eggs, mashed bananas, pumpkin puree and vanilla.
1/2 cup Butter, 1 cup Sugar, 2 Eggs, 1 teaspoon Vanilla, 2 Bananas, 1/2 cup Pumpkin Puree
Add the dry ingredients to the wet ingredients and mix with a spatula until all ingredients are incorporated.
Mix in walnuts. Spoon the mixture evenly into each cup or the paper liners.
1 cup Chopped Walnut
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.