Step 1

Preheat the oven to 375° and line a muffin pan with paper liners or spray with non-stick cooking spray.

Step 2

In a medium bowl, whisk flour, baking powder, baking soda and salt together. Set aside.

Step 3

In a large bowl, mix melted butter, sugar, egg and vanilla together until combined.

Step 4

Stir in flour mixture and then fold in mashed bananas and one cup of chopped walnuts.

Step 5

Spoon muffin batter into the prepared muffin pan and sprinkle coarse sugar and the remaining ¼ cup of chopped walnuts on each muffin.

Step 6

Bake for 20 minutes or until a toothpick inserted in the center comes out clean and the tops are golden.

Step 7

Carefully remove from the oven and let sit for a couple minutes then transfer to a wire rack to cool.