1. Preheat oven to 400 degrees F. Bake yams for about 1 hour. Make sure they are soft to the touch when done. In a nonstick saute pan, combine the margarine and onions. Let onions soften.
2. Add the brown vegan sugar, maple syrup, and cinnamon into the saute pan. Let it caramelize the onions.
3. When potatoes are done, peel off the skins (make sure you get them all) and put into a large serving bowl. Mush them up a little, add a little bit of margarine.
4. Take the onion mixture, drain, and pour them on top of the potatoes. Sprinkle with a little more brown vegan sugar, add fresh ground pepper, and you'll keep asking for more! Enjoy.