Buttermilk–Blue Cheese Potato au Gratin

Buttermilk–Blue Cheese Potato au Gratin was pinched from <a href="https://newengland.com/today/food/buttermilk-blue-cheese-potato-au-gratin/" target="_blank" rel="noopener">newengland.com.</a>
INGREDIENTS
6 large Yukon Gold potatoes, peeled sliced 1/4-inch-thick
3 tablespoons salted butter, plus more for the pan
3 shallots, minced
2 1/2 tablespoons all-purpose flour
1 1/2 cups whole or 2% milk
1 cup buttermilk
2 1/2 ounces blue cheese, crumbled, divided
2 teaspoons mustard (Dijon or brown)
2 teaspoons Worcestershire sauce
1 1/2 teaspoons table salt
1/2 teaspoon freshly ground black pepper
3/4 cup grated Parmesan cheese, divided
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