Banana Oatmeal Raisin Muffins

Bahan-bahan (12 porsi)

• ½ cup raisins
• 1 tablespoon water
• 1½ cup all-purpose flour
• 1 teaspoon baking powder
• ¼ teaspoon baking soda
• ¼ teaspoon salt
• ½ cup brown sugar
• ½ cup quick oats (+ extra for topping)
• ½ cup milk (+ 2 tablespoons )
• 1 large egg
• ½ cup vegetable oil
• 2 mashed overripe banana