Wash and dry the potatoes. Place each potato between two chopsticks and make thin slices about 1/8 inch apart, cutting almost to the bottom but not through.
Mix melted butter with minced garlic, chopped thyme, salt, and pepper.
Place potatoes on a baking sheet and brush the butter mixture generously over them, making sure to get some between the slices.
Bake for 45-50 minutes, basting with remaining butter mixture every 15 minutes, until potatoes are crisp on the edges and tender inside.
Remove from oven and serve warm as a delicious side dish.
Notes
For extra flavor, sprinkle grated Parmesan cheese or chopped parsley over the potatoes before serving.