INGREDIENTS
4
Garlic cloves, large
2 tsp
Thyme, fresh leaves
1
White or yellow onion, small
4
lbs Yukon gold potatoes
1 cup
Chicken stock or vegetable stock
3 tbsp
All-purpose flour
1/2 tsp
Black pepper
1 tsp
Kosher salt
3 tbsp
Butter
1 1/2 cups
Cheddar cheese, sharp
2 cups
Milk
1/2 cup
Parmesan cheese