INGREDIENTS
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8 medium Russet potatoes, peeled and cubed
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4 tablespoons unsalted butter
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1 teaspoon kosher salt
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1/2 teaspoon garlic salt
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1/2 teaspoon freshly ground black pepper
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1 cup warmed milk
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1/4 cup grated Parmesan Cheese
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1 1/2 cups pasta or marinara sauce
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1 1/2 cups shredded mozzarella cheese
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