Hi, How far in advance can I make this frosting? My son's first birthday is in a week and I'd like to use this recipe...also, would meringue powder work in place of the egg whites? You can certainly use meringue powder in place of the egg whites: Use 1/2 cup water and sprinkle 1/4 cup of meringue powder or dried egg whites on top. Whisk them together until the powder is moistened. Then continue on with the recipe! Because the frosting is based on egg whites, it will harden eventually, if exposed to air (in a matter of hours, I would say). You could make it the day before and keep covered at room temperature until you're ready to frost, icing the cake an hour before serving. The frosting might also deflate a bit between the time you mixed it and the time you frost--I would not beat it to try and incorporate air! For a more stable icing, you could do our Quick Buttercream, adding the optional meringue powder--this will keep at room temperature, in an airtight container, for 3-4 days ahead of the party! http://www.kingarthurflour.com/recipes/quick-buttercream-frosting-recipe I hope your son has a wonderful 1st Birthday!! ~Kim@Kaf

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