01 -
Cook elbow macaroni in a large pot of boiling salted water for 7 to 8 minutes, stirring occasionally, until al dente. Drain and set aside.
02 -
Add cooked macaroni, sharp cheddar cheese, Monterey Jack cheese, whole milk, butter, salt, and black pepper to the slow cooker. Mix thoroughly to ensure all elements are well combined.
03 -
Cover and cook on low heat for 2 to 3 hours, stirring occasionally. Continue cooking until the mixture is smooth and cheese has fully melted. Add additional milk if a looser consistency is desired.
04 -
Transfer to serving dishes and serve hot.