optional: grated parmesan cheese and chopped parsley for topping
Instructions
Add macaroni, milks, and cheeses to slow cooker. Stir to combine. Cover and cook on low for 1 hour.
After one hour add ground mustard, salt, and garlic powder. Stir to combine. Cover and cook 20-30 minutes longer. Check to see if macaroni is tender and cheese is fully melted. If needed, cover and cook 15-30 minutes longer. Serve warm and sprinkle with parmesan cheese and parsley if desired.