Grease ceramic insert with non-stick cooking spray or butter.
In large bowl, combine cheeses and set aside. In another large bowl, whisk eggs lightly. Add evaporated milk, milk, dry mustard, cayenne, nutmeg, salt, and pepper. Whisk to combine.
Add 3 cups of the cheese and uncooked macaroni noodles to egg mixture; stir to combine.
Pour into the ceramic insert. Top with remaining cheese and sprinkle with paprika.
Cook at LOW for 4 hours, or until pasta is cooked.