Belgian Waffles

Bahan-bahan (4 porsi)

• 3 cups all-purpose flour
• 2 teaspoons baking powder
• ½ teaspoon baking soda
• ½ teaspoon salt
• 3 tablespoons granulated sugar
• 3 eggs (separated)
• 2 ½ cups buttermilk
• ⅓ cup melted unsalted butter
• 1 teaspoon vanilla extract