Banana Bread Muffins

Bahan-bahan (12 porsi)

• 1 ½ cups all-purpose flour
• 1 teaspoon baking soda
• ¾ teaspoon cinnamon
• ½ teaspoon salt
• ½ cup melted butter
• ⅓ cup granulated sugar
• ¼ cup brown sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 1 cup mashed bananas (about 3 medium)
• ½ cup chopped walnuts (or pecans, optional)