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Preheat the oven to 200 degrees.
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Preheat a Belgian waffle iron.
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In a medium-sized bowl, sift together flour,sugar, baking powder and baking soda.
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In a different medium-sized bowl, whisk together sour cream, egg yolks, margarine and extract.
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Pour this mixture into the dry ingredients, stirring to form a lumpy batter.
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In a different medium-sized bowl, beat the egg whites until stiff peaks form.
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Using a spatula, gently fold the egg whites into the batter until thoroughly mixed.
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Lightly spray the waffle iron with cooking spray.
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Spoon about 1/3 cup of batter (amount varies with the size of your iron) onto the hot iron and spread it almost to the corners of the grids.
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Close the lid and bake until the waffle is golden brown, its edges look dry and it does not stick to the grids-- about 2 minutes.
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Transfer the baked waffle to the warm oven,placing it directly on the rack so that it will stay crisp.
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Repeat with the remaining batter.
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Serve hot with desired toppings.