Preheat oven to 425 degrees.
Melt vegan margarine with garlic cloves and remove cloves before using.
Prepare a baking dish by brushing melted butter all over the bottom and sides.
Peel and slice the potatoes (trimmed square if you prefer) 1/8" thick. Try keeping the slices together in a stack, it makes for easier presentation.
Shingle the potatoes around the pan (any pattern you prefer, I went in a spiral).
Brush with the remaining melted vegan margarine.
Season with salt, pepper and fresh thyme leaves.
Bake for about 30-40 minutes or until golden brown. I usually move the dish to the top rack of the oven for more even browning. PLEASE NOTE: All ovens are different, please keep an eye on how things are cooking. You don't want too much browning, but the potatoes need to be tender.
Allow to stand for 5 minutes before serving. That vegan margarine is HOT!