This may well be a recipe someone else has already come up with, in which case I declare myself the Finder-Keeper and you, the original inventor, the Loser-Weeper! So ha! The joke's on you!
...anyways, this isn't a super strict recipe, but it's an easy one and one I've used on many an occasion, both for high holy days of the year like Canadian Thanksgiving and for a quickie microwave-baked sweet potato for lunch at work. If you don't like what I put in, then mess around with it and make it your own!
Mashed Sweet Potatoes
Butter or margarine (to taste)
Mashed or powdered garlic (to taste)
Onion powder (to taste)
Cinnamon (to taste)
Nutmeg (to taste)
Cardamom (to taste)
Pepper (to taste)
Salt (to taste)
1) Lord, bless!
2) Skin any disturbing abberrancies off the sweet potatoes and boil or bake them until they're nice and soft. (Check the largest one(s) with a fork or knife if you're not sure whether they're done.)
3) Mash the sweet potatoes up with the remaining ingredients until they're nice and creamy. Unless you want a nutrient deficiency leave the skins on! The skins also make for a nice texture in the finished product in addition to being tasty and good for you. (But if you're just that boring and white bread, then feel free to take them off.) I tend to use a lot of butter and garlic and a fair amount of cinnamon followed by smaller amounts of the remaining ingredients, but it's really up to you and your taste buds how much of what you put in!
4) Serve topped with some sour cream or whatever else you think would taste good and enjoy!