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2 tablespoons softened salted butter

8 large russet potatoes, cleaned 

3 cups heavy cream 

1 cup whole milk 

1/4 cup all-purpose flour 

2 teaspoons kosher salt 

1/2 teaspoon freshly ground black pepper 

1 1/2 cups grated fontina cheese

6 ounces queso blanco, grated 

1 1/2 cups grated white Cheddar 

2 tablespoons sliced fresh chives