Nope, sorry. Once that sugar is ground into a powder and mixed with cornstarch, you can’t un-powder it. It would be like trying to uncook an egg. Not happening.
But you can go the other way! If you have granulated sugar and a blender, you can make your own confectioners’ sugar in about 30 seconds. Just blend 1 cup of granulated sugar with 1 tablespoon of cornstarch until it’s fluffy. Bada bing, bada boom.
So if you ever run out of the powdered stuff, you’re the hero of your own kitchen. But if you run out of granulated? You might be stuck making a very soft batch of cookies, my friend.
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When is it actually okay to swap?
Let’s be practical. You can swap them in whipped cream (confectioners’ sugar dissolves faster, so it’s actually better), sweet sauces, cold drinks (like iced tea or lemonade), and no-bake cheesecakes. In those cases, the cornstarch is either a bonus or a non-issue.
Also, if you’re making meringue? Never use confectioners’ sugar. The cornstarch will ruin the structure, and you’ll end up with a sad, weepy puddle of egg whites. Nobody wants that drama.
And for caramel? Absolutely not. Confectioners’ sugar won’t caramelize the same way—it’ll burn or get lumpy. You’ll end up with a sticky mess that tastes like regret.
