Whether this Thanksgiving centerpiece incites horror, amazement, or confusion when it’s served, it’s certain to evoke some kind of outburst. Warning: This dish is not recommended for people who require an inch of space between food groups.
Game plan: The mashed potatoes and sweet potatoes can be made ahead. Rewarm them just prior to assembling the cake, so they are easy to spread.
If your attention lapses and the marshmallows happen to burn or catch fire while broiling (this actually happened to us), relax and just blow out the flames. Peel away the burnt marshmallows, leaving the sweet potato layer intact, and start over with a fresh topping of marshmallows.
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