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Preheat the oven to 375 degrees F and lightly grease 2 muffin tins with butter.
Add the melted butter, vanilla and eggs, and beat well scraping down the sides of the bowl once or twice. Mix in the dry ingredients just until incorporated. Fold in the nuts, chocolate and reserved mashed bananas with a rubber spatula. Spoon the batter into the prepared muffin tins to fill them just over halfway. Give them a rap on the counter to get any air bubbles out.
Bake until a toothpick stuck in the muffins comes out clean, 18 to 20 minutes. Cool for a few minutes before turning the muffins out of the pan.