Whole Wheat Banana Oat Muffins

Ingredients (16 items)

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• 1 cup rolled oats
• ¾ cup whole wheat flour
• ¾ cup all-purpose flour
• ¼ cup white sugar
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• ½ teaspoon salt
• ½ teaspoon ground cinnamon, or more to taste
• ¼ teaspoon ground nutmeg, or more to taste
• 2 eggs
• ¾ cup milk
• ⅓ cup vegetable oil
• ¼ cup brown sugar, packed
• ½ teaspoon vanilla extract
• 3 extra-ripe bananas, mashed
• 1 cup walnuts, crushed using a rolling pin