Blueberry Maple Muffins

Bahan-bahan (12 porsi)

• 2 cups all-purpose flour
• 1 tablespoon baking powder
• ½ teaspoon salt
• 1 cup plain low fat yogurt
• ¾ cup granulated white sugar
• 6 tablespoons (¾ stick) unsalted butter, (melted)
• 2 large eggs, (at room temperature)
• ½ teaspoon maple extract
• 2 tablespoons all-purpose flour
• 2 tablespoons granulated white sugar
• 1 cup fresh blueberries, (rinsed)
• coarse sugar, (for topping (optional))