In a different large bowl whisk together remaining ingredients, except pasta.
Add pasta and 3 cups of cheese to the milk and egg mixture and stir well.
Pour mixture into a lightly greased 6 quart slow cooker and push your macaroni down into the other ingredients so it is not sticking up out of the other ingredients. (This makes it so your pasta can have the liquid it needs to cook all the way.)
Sprinkle with remaining cheese mixture.
Cover and cook on low for 1-4 hours (timing varies greatly depending on your crockpot) until cheese is melted and creamy and pasta has reached desired tenderness.
Notes
Different slow cookers will cook this dish wildly different. The original recipe this recipe is based on called for cooking it on low for 4 hours. Mine was done in 1 1/2 hours on low. It would have been burnt to a brick by 4 hours. This is NOT a fix it and forget it recipe. I highly recommend that you time your own slow cooker the first time you use this recipe to know how long yours takes and not base your time on mine or the original.
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As with any of our recipes, carb counts, calorie counts and nutritional information varies greatly. As a result, your nutritional content depends on which products you choose to use when cooking this dish. The auto-calculation is just an automated estimate and should NOT be used for specific dietary needs.
All slow cookers cook differently, so cooking times are always a basic guideline. Recipes should always be tested first in your own slow cooker and time adjusted as needed.