Gluten-Free Sweet Potato Casserole for Thanksgiving

Baked gluten-free sweet potato casserole with golden pecan streusel topping in a ceramic dish

Every Thanksgiving table has one dish that looks safe and is not quite safe. Sweet potato casserole is usually that dish. The sweet potato part is fine. Nobody puts wheat in mashed sweet potatoes. The trouble is the topping, which is where gluten hides in plain sight.

The classic version comes two ways. One has a brown sugar streusel with pecans. The other has a layer of toasted mini marshmallows. Both are delicious, and both need one change each to be gluten-free. Neither change affects the taste in any way your guests will notice.

The streusel version: swap the flour, keep everything else

A standard streusel is butter, brown sugar, flour, and pecans. The flour is there for structure, and it is the only problem. Replace it with an equal amount of almond flour and the topping bakes up crisp and buttery with a slightly richer flavor. If you want more crunch, add a half cup of certified gluten-free oats to the mix.

Certified matters here. Regular oats are grown and processed alongside wheat, and cross-contact is common enough that celiac organizations recommend the certified kind. For one topping, a small bag of certified gluten-free oats is cheap insurance.

The marshmallow version: the label is the whole recipe

Plain marshmallows are almost always gluten-free. The dusty white coating that keeps them from sticking is cornstarch, not flour. That said, marshmallows are one of those products where the recipe changes by brand and by year, so this is a read-the-label-every-time situation. If the ingredient list is the usual short list of corn syrup, sugar, dextrin, and gelatin, you are fine.

One thing to watch: flavored or stuffed marshmallows, and anything coated in cookie crumbs or graham dust, are a different product. Stick to plain minis for the casserole.

Roast the potatoes, do not boil them

This is the technique tip that changes the whole dish. Boiling sweet potatoes waterlogs them, and then you are fighting a soupy mash that needs extra starch to hold together. Roasting them whole at 400F until they collapse concentrates the sugars and drives off moisture. The mash comes out thick and sweet on its own, which means less added sugar and a firmer casserole.

A medium sweet potato takes about 45 to 60 minutes. You can roast them the day before and scoop the flesh into a container. That is the single biggest time saver in the whole recipe.

Make-ahead is the point of this dish

Thanksgiving day oven space is the scarcest resource in the house. Sweet potato casserole does not care. Assemble the base the day before and refrigerate it. Add the streusel topping or the marshmallows right before it goes in the oven, since both suffer from sitting. Bake at 350F for about 25 to 30 minutes, until the topping is golden and the edges bubble.

If you go the marshmallow route, keep a close eye in the last few minutes. They go from toasted to scorched fast, and a broiler finish takes about sixty seconds.

The full version I make every year takes about ten minutes of prep and twenty in the oven, and the gluten-free sweet potato casserole recipe on gfcooking.food has both topping options with exact measurements. It feeds a crowd and it reheats well, which is more than most Thanksgiving dishes can say.

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