Step 1

Preheat the oven to 375 degrees, and lightly grease a muffin tin.

Step 2

Place the mashed bananas in a large bowl.

Step 3

Add the sugar, oil, baking powder, baking soda, salt, and flour, and gently mix together until well combined.

Step 4

Fold the carrots and walnuts (if using) into the batter.

Step 5

Spoon the batter into the muffin tin, filling each cup to the top.

Step 6

Bake for 25 minutes or until the muffins are golden brown.