Banana Oat Muffins with Sour Cream

Details

Ingredients

• 1 cup rolled oats
• 1 cup all-purpose flour
• 1 tablespoon rolled oats
• ½ cup chopped walnuts
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• ¼ teaspoon ground cinnamon
• ½ teaspoon salt
• ½ cup butter, softened
• 1 cup white sugar
• 2 eggs
• 1 cup mashed ripe banana
• 1 teaspoon vanilla extract
• ½ cup sour cream
• ⅓ cup rolled oats
• 4 tablespoons brown sugar
• ¼ teaspoon ground cinnamon
• 2 tablespoons butter, chilled
• ¼ cup chopped walnuts