Scalloped Potatoes with Three Cheeses Recipe | Epicurious

Ingredients

• 3/4 cup (packed) grated extra-sharp cheddar cheese (about 4 ounces)
• 3/4 cup crumbled Danish blue cheese (about 4 ounces)
• 1/3 cup (packed) freshly grated Parmesan (about 1 1/4 ounces)
• 4 pounds russet potatoes, peeled, cut into 1/4-inch-thick rounds
• 1 1/2 teaspoons salt
• 1/2 teaspoon ground black pepper
• 1/4 cup finely chopped onion
• 3 tablespoons all purpose flour
• 4 tablespoons (1/2 stick) butter
• 3 cups whole milk