Depending on the size of your house and how you're going to decorate it, you may need more than one batch of this icing. If so, make subsequent batches as you need them.
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4 large egg whites
About 7 1/2 cups powdered sugar
Using an electric mixer fitted with the whisk attachment, beat the egg whites for 1 minute, until they are foamy. Add 1/2 cup of the sugar and beat until blended. Continue adding the remaining sugar 1/2 cup at a time and beating well after each addition until you've added 7 cups. You want an icing that's thick and easily spreadable. If you think you need more sugar to make it thicker, add the remaining 1/2 cup a few spoonfuls at a time.
In order to keep the icing soft when you're not using it, cover the bowl with a piece of damp paper towel or damp cheesecloth. Press the towel or cloth against the surface of the icing and then cover with plastic wrap. While you're working with the icing, it's good to keep the moist covering in place.
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