INGREDIENTS
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5 pounds russet (Idaho) potatoes
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1 medium onion, finely chopped
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1 1⁄3 pounds ham, cut into 1⁄2-inch cubes
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8 slices bacon (not thick-cut), cut into squares
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1 stick (4 ounces) unsalted butter
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2 tablespoons garlic salt
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1⁄2 teaspoon freshly ground black pepper
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1 1⁄2 cups all-purpose flour
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5 1⁄2 cups whole milk