Blueberry Cinnamon Muffins

Bahan-bahan (15 porsi)

• ¼ cup oats
• 2 tablespoons brown sugar
• ½ teaspoon cinnamon
• 1 cup granulated white sugar
• ¼ cup (½ stick) butter, (at room temperature)
• 2 large eggs
• 1 teaspoon vanilla extract
• 2 cups all purpose flour
• 1 teaspoon baking soda
• ½ teaspoon baking powder
• ½ teaspoon salt
• ½ teaspoon cinnamon
• 1¼ cups low fat buttermilk
• 1 cup fresh blueberries