1 cup all-purpose flour
2 teaspoons sugar
½ teaspoon salt
½ teaspoon baking powder
¼ teaspoon baking soda
¾ cup buttermilk*
¼ cup milk
1 large egg, separated
2 Tablespoons unsalted butter
* if you don't have buttermilk, mix 2/3 cup regular milk with 1½ Tablespoons lemon juice and let the milk sit for 5 minutes to it curdle a bit
Prepare batter:
