Foryoueats: Light and Fluffy Buttermilk Pancakes

Ingredients

• Basic Dry Pancake Mix:
• 10 ounces (about 2 cups) all purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1 teaspoon kosher salt
• 1 tablespoon sugar
• For Each Batch of Pancakes
• 2 large eggs, separated
• 1 1/2 cups (about 12 ounces) buttermilk
• 1 cup (about 8 ounces) sour cream (see note)
• 4 tablespoons unsalted butter, melted, plus more for serving
• Warm maple syrup