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Step 1: Salt the water and cook elbow macaroni for 6 minutes.
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Step 2: Mix cheese, butter, sour cream, evaporated milk, heavy cream, and egg.
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Step 3: Season with salt, pepper, smoked paprika, and mustard powder.
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Step 4: Layer the cheese mixture and sprinkle with paprika.
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Step 5: Bake at 350°F for 25 minutes and broil for 5 minutes for a crispy top.