Melt butter with garlic and pour 2 tbs into a 9 x 9-inch baking dish; coat entire bottom of the pan.
Using a sharp knife or mandolin, slice potatoes into thin slices, about 1/16th of an inch. Hint: Use the mandolin, it’s much more precise and easier.
Arrange potatoes standing up but with a slight fanning (see photos in post).
Drizzle remaining butter over the potatoes. Sprinkle with the thyme, salt and pepper.
Bake, basting occasionally, for about 60 minutes or until tops are getting brown and crisp and potatoes are done.
Notes
Rosemary is a nice substitute for the thyme. If using dried herbs (not recommended) use HALF the amount of fresh called for in the recipe.You can peel the potatoes if you wish. I did not as I like the skin.