How To Make the Best Au Gratin Potatoes

"Cheesy potato casserole. Need we say more?..."

INGREDIENTS
8 ounces Gruyère or sharp cheddar cheese, or a combination
3 pounds Yukon gold or red potatoes
1 small yellow onion
2 cloves garlic
4 tablespoons plus 1 teaspoon unsalted butter, divided
1/4 cup all-purpose flour
1 teaspoon Dijon mustard
1 teaspoon kosher salt
1/4 teaspoon freshly ground black pepper
2 cups whole milk
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