INGREDIENTS
3/4 cup
shredded sharp Cheddar
3/4 cup
shredded Swiss cheese
1/2 cup
grated Parmesan
3 tbsp
all-purpose flour
4 lb
russet potatoes, peeled, sliced crosswise 1/4-inch thick
Salt and pepper
4 tbsp
unsalted butter, softened
3 cups
whole milk