01 -
3 tablespoons of butter, unsalted.
02 -
2 cups of milk, whole.
03 -
1/4 cup flour, plain.
04 -
1/2 teaspoon ground black pepper.
05 -
4 garlic cloves, finely grated.
06 -
1 1/2 cups grated cheddar cheese.
07 -
1 tablespoon of fresh thyme, leaves picked.
08 -
1 cup broth, vegetable-based.
09 -
2 teaspoons sea salt.
10 -
1/2 medium yellow onion, very thin slices.
11 -
Butter for prepping the baking dish.
12 -
3 pounds Yukon Gold potatoes, cut into 1/8 inch slices.