Preheat oven to 350 degrees F.

Line or grease a muffin tin.

In a large mixing bowl, beat sugar and butter together until light and fluffy.

Beat in eggs and vanilla.

In a separate bowl, thoroughly mash the bananas.

Fold the bananas into the sugar mixture.

In a separate mixing bowl, whisk the flour, baking soda, and salt together, until thoroughly combined.

Using a spatula, gently mix the flour mixture into the sugar mixture.

Gently fold in the walnuts and chocolate chunks.

Pour mixture into prepared muffin tin, filling just over ⅔s full.

Allow batter to sit in the tin for 20 minutes before placing in the oven.

Bake for 18-20 minutes or until just beginning to go brown on the top.