My Vegan/Celiac Niece-in-law makes this and it is quite good. She does not remember where she got the recipe (it is not her own).
10 potatoes, peeled and cut into chunks
½ cup (1 stick) margarine
¼ cup non-dairy creamer
1 teaspoon salt
2 onions, sliced
2 tablespoons oil
½ teaspoon sugar
Place potatoes in a large pot and cover with water. Bring to a boil and reduce heat. Simmer until potatoes are soft – about 20 to 30 minutes. Drain and mash with margarine, non-dairy creamer and salt. Spread potatoes in a greased 9 x 13-inch pan and smooth top.
Preheat oven to 350 degrees. Sauté onions over low to medium heat until lightly browned – about 10 minutes. Add sugar and sauté 5 minutes more. Lay across top of the potatoes. Bake for 30 to 45 minutes.