01 -
Thinly slice 3 pounds Yukon Gold potatoes, about 1/8-inch thick.
02 -
Slice half a medium yellow onion into thin pieces.
03 -
3 tablespoons of unsalted butter, softened.
04 -
1/4 cup plain flour.
05 -
2 cups of whole milk, cold.
06 -
1 cup vegetable stock.
07 -
Grated 4 garlic cloves.
08 -
Fresh thyme leaves, 1 tablespoon.
09 -
2 teaspoons sea salt, fine.
10 -
1/2 teaspoon of black pepper, freshly ground.
11 -
1 1/2 cups shredded cheddar cheese.
12 -
Butter for coating the dish.