Lightly grease mini muffin cups. Sprinkle with 2 tablespoons Parmesan cheese, tapping out excess. Melt butter in a large saucepan over medium heat. Stir in flour; cook for 2 minutes.
Whisk in milk until boiling, about 5 minutes. Add Cheddar and American cheeses; remove from heat and stir until smooth. Whisk in egg yolk and paprika; fold in macaroni until well coated. Spoon rounded tablespoons of mixture into prepared tins; sprinkle with remaining Parmesan.
Bake at 425 degrees until hot and golden, about 10 minutes. Cool for 5 minutes; carefully transfer to a serving plate.