Banana-Walnut Muffins

Details

Ingredients

• 1 ¼ cups walnuts, finely chopped
• 2 cups all-purpose flour
• ¾ cup white sugar
• ¾ teaspoon baking soda
• ½ teaspoon salt
• 3 very ripe bananas, mashed
• 2 eggs, beaten
• 6 tablespoons unsalted butter, melted and cooled
• ¼ cup sour cream
• 1 teaspoon vanilla extract