INGREDIENTS
3 lb
potatoes (Yukon Gold or Russet)
1/4 cup
unsalted butter
1/2 cup
yellow onion (finely chopped)
1/4 cup
all-purpose flour
2 cups
whole milk
1/2 tsp
salt
1/2 tsp
pepper
12
slices ham
1 cup
cheddar cheese (shredded)
2
cups mozzarella cheese (shredded)
1/4
cup parsley (chopped)