Slow Cooker Mac and Cheese is creamy and delicious. This is a three cheese macaroni recipe. Easy to make and very cheesy.
Spray the crock of a 5 qt or 6 qt slow cooker with cooking spray. Add the cubes of butter.
Bring a pot of water to boil and add the macaroni. Cook for about half the time the package directions say. You want the pasta cooked to about 85% done, but not all the way or it will get overcooked and mushy in the slow cooker. Drain well.
Turn on the slow cooker to Low. Add the pasta to the crock.
Add the cheese cubes, but don't stir.
Sprinkle on the shredded cheese and the parmesan, but don't stir.
Pour in the milk. Do not stir. Put the lid on and cook for 1 hour on Low. Do not cook on High.
After 1 hour, add the ground mustard, if using, and stir the mac and cheese. Taste a noodle or two to test doneness. If not done, put the lid back on, turn the heat down to Warm, and cook another 45 minutes to 1 hour, or until it reaches desired doneness.
Stir again, and test for doneness. Mine usually cooks in just under 2 hours (1 hour on Low, and 1 hour on Warm). This is how I avoid overcooking it. Of course, every slow cooker is a little different.
When done, turn off the slow cooker. Stir in a little warmed milk if you like it creamier. Taste and add a little salt and pepper, if needed.