Spray crockpot with olive oil spray or rub it with butter.
Add water, whole milk, heavy cream, sour cream, sea salt, and pepper to the container of a slow cooker and whisk to combine.
Then, add the macaroni and stir.
Top with cubed butter.
Cover and cook on low for 1 to 1.5 hours, or until the pasta is al dente but not too soft. (check at 1 hour. Do not overcook the pasta).
Once the pasta is al dente, add the shredded cheese and stir to combine.
Cover and cook for 15-30 minutes, or until cheese is melted.
Stir and serve warm.
