01 - Coat the insert of a slow cooker with non-stick spray to prevent sticking.
02 - Transfer uncooked elbow macaroni, milk, heavy cream, melted unsalted butter, softened cream cheese, mustard powder, garlic powder, salt, and black pepper into the slow cooker. Stir thoroughly to blend the mixture.
03 - Secure the lid and cook on low heat for 2 to 3 hours, stirring every 30 minutes to ensure even cooking.
04 - Once macaroni is tender, add shredded sharp cheddar cheese and stir until the cheese is fully melted and a creamy consistency forms.
05 - Serve immediately while hot, garnished with paprika if desired.