Sweet Potato Casserole with Pecan Streusel for Thanksgiving

Sweet potato casserole is one of the most loved side dishes on the American Thanksgiving table, and with the holiday about six weeks away it is the perfect time to practise it. This version is silky and lightly sweet, with a crunchy pecan streusel instead of the usual wall of marshmallows, so it sits happily next to turkey, gravy and cranberry sauce without tasting like dessert.

Why roast the sweet potatoes?

Boiling adds water, and watery mash means a loose casserole. Roasting whole sweet potatoes concentrates their sweetness and gives a thicker, deeper-flavoured base. Prick them with a fork, bake at 200°C (400°F) for 50 to 60 minutes until very soft, then scoop out the flesh. Let it cool for 10 minutes so the eggs do not scramble when you mix.

Tips for the best result

• Do not over-mix. Beat until just smooth; a food processor can turn the mash gluey.
• Keep the butter cold in the streusel. Cold butter rubbed into the flour gives crisp, crumbly clusters.
• Toast the pecans for 5 minutes in a dry pan or oven for a stronger, nuttier flavour.
• Season boldly. Sweet potatoes need salt; a small pinch of cayenne or a squeeze of orange zest keeps the dish from tasting flat.

Variations

• Marshmallow topping: skip the streusel and scatter mini marshmallows over the top for the last 10 minutes of baking.
• Less sweet: reduce the brown sugar in the base to 40 g and add a little orange zest.
• Nut-free: replace the pecans with rolled oats or pumpkin seeds.
• Savoury twist: use thyme, black pepper and a little grated Gruyère instead of the sugar and spices.

Make ahead and storage

Assemble the base up to 2 days ahead and keep it covered in the fridge; keep the streusel separate in an airtight container so it stays crisp. On the day, add the topping and bake until bubbling at the edges. Leftovers keep for 4 days in the fridge and reheat well in a 175°C (350°F) oven for 15 minutes. The unbaked base also freezes for up to 2 months.

Serving ideas for your Thanksgiving menu

Serve it alongside roast turkey, make-ahead gravy, creamy mashed potatoes and a tart cranberry orange sauce. Because it bakes at the same temperature as most holiday sides, it fits easily into a busy oven schedule. A bowl of green salad with pomegranate seeds adds freshness to the plate.

Who should be careful: this dish contains tree nuts, eggs, dairy and gluten. People managing blood sugar should watch portion size, as the casserole contains added sugar.