Step 1

Preheat oven to 375 degrees F.

Step 2

Use a mandoline to thinly slice potatoes to 1/8 inch thick. Put into large bowl. Then grate gruyere cheese and set aside.

Step 3

Add salt, black pepper to bowl and toss potatoes to coat as evenly as possible. Then add flour, thyme, garlic to the potatoes and toss again to distribute. Add 1/2 of cheese to potatoes and toss.

Step 4

Butter a 7x10 baking dish and put half of potatoes into the dish, laying them flat. Add a little bit more cheese over the top of them. Then place remaining potatoes on top of the others, in a flat and organized manner. Sprinkle with remaining cheese.

Step 5

Pour half-n-half/cream over the potatoes, distributing evenly. Cover the top of the pan with aluminum foil and secure it tightly.

Step 6

Bake for 30 minutes covered, then remove foil and bake for 20-30 more minutes more, until potatoes are cooked through, and can be pierced easily with a fork and everything is golden brown and bubbling. Remove from oven and serve warm.