Step #2 Whisk dry ingredients together in a medium bowl.
Step #3 Whisk yolk with cream, water & butter.
Step #4 Beat egg white until it just holds a 2-inch peak.
Step #5 Add liquid ingredients to dry ingredients in a thin steady stream while carefully mixing with a rubber spatula; be careful not to add liquid faster than you can incorporate it.
Step #6 Toward end of mixing, use a folding motion to incorporate ingredients; carefully fold egg white into batter.
Step #7 Spread appropriate amount of batter onto waffle iron.
Step #8 Following manufacturer's instructions, cook waffle until golden brown, 2 to 5 mins.
Step #9 Serve as soon as possible.
Step #10 (You can keep waffles warm on a wire rack in a 200-degree oven for up to 5 mins.
Step #11 ) Makes 3 to 4 waffles.
Step #12 NOTES : "If you're out of buttermilk, try this sweet-milk variation.