Blueberry Waffles

Bahan-bahan (8 porsi)

• 1 ⅓ cup fresh blueberries
• 2 cups all-purpose flour (+ 1 tablespoon)
• 2 tablespoons granulated sugar
• 1 ½ teaspoons baking powder
• ½ teaspoon baking soda
• ½ teaspoon salt
• 1 ½ cups buttermilk
• 2 eggs (separated)
• ⅓ cup melted butter
• ¼ teaspoon almond extract (or 1 teaspoon vanilla extract)