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Spray the inside of your slow-cooker with cooking spray or grease it with olive oil. Combine milk, evaporated milk, eggs, butter, and salt in slow cooker and whisk until until smooth
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Add the shredded cheese and macaroni, sprinkle with black pepper. Stir gently with a spatula to coat evenly. Cover and cook on HIGH for 30 minutes.
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After 30 minutes, reduce the temperature to LOW and cook for 2 to 2 ½ hours, until custard is set in the center and the pasta is tender. The macaroni and cheese may sit in the cooker on the KEEP WARM setting for 30 minutes before serving. Sprinkle with toasted bread crumbs and Italian seasoning if desired.