Blueberry Oatmeal Muffins

INGREDIENTS

• 1 2/3 cups quick-cooking oats
• 3 ounces all-purpose flour (about 2/3 cup)
• 2.33 ounces whole-wheat flour (about 1/2 cup)
• 3/4 cup packed light brown sugar
• 2 teaspoons ground cinnamon
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 3/4 teaspoon salt
• 1 1/2 cups low-fat buttermilk
• 1/4 cup canola oil
• 2 teaspoons grated lemon rind
• 2 large eggs
• 2 cups frozen blueberries
• 2 tablespoons all-purpose flour
• Cooking spray
• 2 tablespoons granulated sugar