→ Main Ingredients
01 -
1 small white or yellow onion, thinly sliced after peeling
02 -
4 pounds Yukon Gold potatoes, sliced into thin 1/8-inch rounds
03 -
4 large garlic cloves, finely chopped
→ For the Sauce
04 -
2 cups whole milk (or half and half)
05 -
1 cup chicken or veggie stock
06 -
1/4 cup plain flour
07 -
3 tablespoons butter
→ Cheese
08 -
1/2 cup Parmesan cheese, freshly grated, plus a bit extra to sprinkle on top
09 -
2 cups sharp cheddar cheese, grated fresh
→ Seasonings
10 -
1/2 teaspoon black pepper
11 -
1 1/2 teaspoons Kosher salt
12 -
2 teaspoons fresh thyme leaves, split into two portions