Coat a 4-quart slow cooker with cooking spray. Combine the partially cooked macaroni, evaporated milk, whole milk, melted butter, salt, pepper, and beaten eggs directly in the slow cooker.
Add the grated sharp Cheddar cheese to the mixture, reserving 1/2 cup for topping.
Stir well to combine all ingredients evenly. Sprinkle the reserved 1/2 cup of cheese over the top, followed by a dash of paprika.
Cover and cook on the LOW setting for approximately 3 hours and 15 minutes, until the cheese is melted and bubbly.