Cornstarch works just know what trade-offs you’re making

Cornstarch will absolutely thicken your soup, but it behaves very differently from flour, and that’s where people get tripped up. It gives you that glossy, almost silky finish and keeps the broth looking clear instead of turning it opaque like flour does. Great for lighter soups or anything where you don’t want a heavy, creamy look.

The catch is stability. Cornstarch-thickened soups can get weird on reheating—think slightly separated or gel-like pockets instead of a smooth texture. It’s not broken, just… not great. If you’re making a batch you plan to reheat later, flour or potato starch tends to hold up better.

Skipping the roux step is fine depending on what you want. A flour roux adds depth and a subtle toasted flavor you won’t get from cornstarch. Cornstarch is more of a quick fix mix it with cold water, stir it in at the end, and you’re done. Just don’t overdo it or it can get a little slick.

If I’m cooking on the fly, I’ll use cornstarch to adjust thickness at the end. If I’m building a soup from the start and want body and flavor, I’m reaching for flour.

Another trick: blend a bit of the soup itself beans, potatoes, rice and stir it back in. Thickens naturally and tastes better.

How are you thickening your soups lately?