INGREDIENTS
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3 lb. Yukon Gold potatoes, peeled and diced
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1 cup (8 oz.) salted butter, cut into 1/2-in. cubes, softened
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3/4 cup crème fraîche or sour cream
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1 3/4 tsp. kosher salt, divided
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8 oz. aged white Cheddar cheese, shredded (about 2 cups), divided
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4 large egg yolks Cooking spray
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5 oz. country ham, thinly sliced
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1/2 cup thinly sliced scallions (about 4 scallions)