➜ The Cook’s Illustrated Thanksgiving Guide:

You can trust the editors of Cook’s Illustrated—experts of all things Thanksgiving—to deliver recipes that work.

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Topping sweet potato casseroles with marshmallows is common practice, but the mini varieties are coated with cornstarch, leaving them chalky, and the large sizes bake up too thick and goopy. (Yes, there is such as thing as too much marshmallow topping).

We find that using half of a large marshmallow is the best way to go. To cut them in half, grease a pair of scissors with cooking spray to keep them from sticking, and cut through the equator.

With this method, your sweet potato casserole will boast the creamiest topping, and the ratio of topping to filling will be perfect.

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Each week, the cast of America’s Test Kitchen brings the recipes, testings, and tastings from Cook’s Illustrated magazine to life on our public television series. With more than 2 million viewers per episode, we are the most-watched cooking show on public television.

More than 1.3 million home cooks rely on Cook’s Illustrated and Cook’s Country magazines to provide trusted recipes that work, honest ratings of equipment and supermarket ingredients, and kitchen tips.

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