Step 1

Preheat the oven to 375 ºF and line a muffin pan with paper liners or spray with oil to grease. Set aside.

Step 2

In a large mixing bowl combine the mashed banana, sugar, milk, oil, apple cider vinegar, and vanilla together. Mix together until fairly smooth.

Step 3

In a small mixing bowl combine flour, salt, baking powder, baking soda, and cinnamon and whisk until fluffy and combined.

Step 4

Add dry ingredients to the wet and mix until mostly mixed together and lumpy (some dry spots are ok). Fold in the chopped walnuts.

Step 5

Divide the batter between the 12 muffins, filling the batter almost to the top. Sprinkle some finely chopped walnuts to the top and lightly press them into the batter.

Step 6

Bake at 375 ºF for 18 - 22 minutes or until a tester comes out clean. Let cool for 5 minutes, then remove the muffins from the tin and cool fully on a wire rack. The muffin liners will peel off more cleanly when the muffins have fully cooled.