Preheat oven to 180oC and arrange the baking cups in a muffin pan.

Mash 2 of the bananas with a fork in a small bowl so they still have a bite of texture.

In a large bowl, cream the MARVELLOSO margarine, eggs, sugar, and salt. Beat the ingredients with an electric mixer for 3 minutes.

After that add in flour, baking soda and vanilla essen. Mix them until all ingredients are mixed together.

Fold in the chopped walnuts and the mashed bananas with a rubber spatula.

Spoon the batter into each of the baking cup and fill about halfway.

Bake for about 18-20 minutes or until the muffins turn brown.