Cook macaroni on stovetop. Drain. Cut butter and cheese into "slices".
Layer ingredients in CrockPot (macaroni, butter, cheese, corn, macaroni, butter, cheese, corn). Sprinkle a little pepper and salt on each layer.
Turn CrockPot on to LOW setting and let sit for 3-4 hours. After the first 45 mins., take the lid off the CrockPot and stir all ingredients so they get mixed together. Check every 45 mins. and stir if needed.