Banana-Walnut Muffins

Ingredients (10)

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