Royal icing is that icing on top of sugar cookies that hardens to where it won’t smudge at all. But it’s great because it’s not like a plastic texture — it’s still chewable and not crunchy. It’s great to use for decorating and gifting cookies because as long as you give it a day to harden, nothing will harm your decorations. You can also use it as a glue to attach decorations.
Here’s a basic recipe for you:
In a medium bowl, we added 1 large egg white (Betsy separated it for me — I ain’t got skills like that). I added 1/4 tsp cream of tartar (look for it on the spice aisle). After Betsy sifted 1 cup confectioners sugar, I added a little at a time, beating the mixture with a hand mixer until it formed soft peaks.
The icing dries quickly once it comes into contact with air, so you really should use it immediately. If you can’t, cover it with a wet cloth and leave it on the counter (not the fridge) until you’re ready to use it. It will last up to 12 hours this way.
You can add food coloring to it to make whatever color you want. If you want it to be white, I definitely suggest adding whitening cream because when it’s plain, it’s a little too grossly cream-colored to make nice cookies. Just don’t add to much or it might get too watery and drip off your cookies.
P.S. If raw eggs freak you out, there are a million other royal icing recipes on the web that use meringue powder and water instead. Just Google search it and you’ll find one!