INGREDIENTS
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2 3/4 cups all-purpose flour
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3 tsp. baking powder
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1 tsp. salt
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2/3 cup butter
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1 1/2 cups white sugar
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3/4 cup champagne (the sweeter the better - even strawberry would be great!!)
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6 egg whites
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3 1/4 cups powdered sugar
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1 cup butter, at room temperature
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1/2 teaspoon vanilla extract
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3 tablespoons champagne, at room temperature