Slow Cooker Mac & Cheese

"An easy recipe for macaroni and cheese in the slow cooker, requiring only milk, butter, macaroni and whatever cheeses you have to hand! This is a great recipe to use up leftover cheeses. I made it after hosting a party with a huge cheeseboard, which we had a lot of leftovers from. As long as you have a mix of soft and hard cheeses, this will turn out great. Blue cheeses in particular add awesome flavor too."