This is really good. I usually don't use all the onions it calls for, though it would be fine if you did--I just don't have the patience! A great side dish or dinner, served with yummy crusty bread and a nice salad.
Heat oven to 400 degrees. Combine potatoes, onion, garlic and tomatoes. Beat together remaining ingredients. pour over vegetables and toss well to coat. Spread in large, shallow baking dish (I use my large lasagna pan). Cover with aluminum foil and bake 30 minutes. Uncover and bake 45 more minutes, or until potatoes are tender. Excellent with cheese melted on top, too (if you aren't vegan, of course).
Adapted from Quick Vegetarian Pleasures