Place the evaporated milk, milk, garlic powder, onion powder, salt and paprika in your slow cooker bowl and whisk together.
Next add the shredded cheese and stir into the liquid. Finally add the cream cheese and the noodles.
Set the slow cooker to LOW for 3 hours (only low, if you cook it on high it will be mush).
After the first hour, stir the ingredients together just to make sure the cream cheese is blending in.
At the end of the 3 hours, it is possible that the crock pot mac and cheese may be a bit thicker than you want. This is a thicker version of mac and cheese, it's not going to be like the stuff out of the box. However, you can absolutely thin it down a bit by adding some more milk and stirring.
If you want to replicate the taste of a more old fashioned baked mac and cheese, you can melt a couple of tablespoons of butter in a small fry pan and then add 1 cup of bread crumbs. Cook just until bread crumbs begin to brown. Sprinkle on top of the finished mac and cheese when serving.