INGREDIENTS
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3 pounds red potatoes, scrubbed and cut into 1/4" slices
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4 tablespoons unsalted butter
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1/4 cup all-purpose flour
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1 teaspoon kosher salt
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1/2 teaspoon onion powder
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1/2 teaspoon fine ground black pepper
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2 cups 2% milk
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12 ounces Colby-jack cheese, shredded (divided)