Preheat oven to 375 degrees Fahrenheit. Spray a 12-cup muffin pan with cooking spray.

Slice potatoes in thin slices with a knife or use a mandolin for evenly cut slices. Place potatoes in a large bowl.

In a measuring cup or glass, combine oil, garlic, thyme, salt, and black pepper.

Pour mixture over potatoes and mix until potatoes are covered in seasoning.

Place potatoes in muffin pan, filling each cup. Sprinkle any leftover seasoning onto potatoes.

Bake for 50–60 minutes, or until tops are golden. If you like a crunchier texture, leave for longer. Remove from oven and let cool for five minutes. Carefully remove from pan and plate. Garnish with parsley or thyme sprigs, if desired.