In medium saucepan combine butter, sharp cheddar cheese, and mozzarella cheese. Stir until everything is melted. Add to crockpot.
Then add sour cream, cheddar cheese soup, milk, dry mustard, salt, and pepper. Stir everything together.
Pour in your 3 beaten eggs.
Add your macaroni and stir again until everything is well combined.
Add the lid to your crockpot and cook for 3 hours on low. Stirring occasionally.
Enjoy!
Notes
Trust the process.The cheese you melt in the pan will look like a big clump and won't fully mix in with everything until the very end.Do not cook it more than 3 hours or it will have a weird consistency and won't taste as good.
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