Place the flour, baking powder, and salt in a 3-quart bowl, and sift together. Set aside.

Place the margarine, sugar, and egg yolks in a 2-quart bowl, and blend with a wire whisk or fork. Add the buttermilk, and continue to blend until the ingredients are thoroughly combined.

Pour the liquid mixture into the dry mixture, and mix with a whisk only until the batter is smooth.

Beat the egg whites until they are stiff. Spread the whites over the batter, and gently fold them into the batter.

Following the manufacturer's instructions, lightly grease your waffle iron. Pour an appropriate amount of batter into the iron, and bake at a moderately hot setting until the iron has stopped steaming and the waffle is crisp and light- to medium-brown. Keep the cooked waffles warm in the oven until all the waffles are done.

Serve hot with the topping of your choice.