I don't know your ability, or equipment available, so yeah, mashed would be my go to suggestion.

You can go traditional, ginger/cinnamon/nutmeg/butter/honey or brown sugar, or you could fuck with their heads and hit them with some curry/yogurt/toasted cumin seeds/garlic/honey/mint

Either way, for mashing, I prefer to roast my sweet potatoes halved with seasonings/sugars on the open half. Scoop out the meat, discard the skin, add more of whatever as needed (something like garlic will need to be roasted/sauteed/whatever first obv), and if using dairy/fresh herbs add after mashing.

Be sure to appropriately salt. Whenever people think "sweet" they forget salt for some reason.

Lemme know if you'd like help in a different direction, or if you want me to elaborate on anything.