That's not exactly healthy either and but it tastes like it should be. Mac n cheese should be creamy AND cheesy and delicious. What you are suggesting sounds plain and dry, I wouldn't touch with a 10 foot pole unless I was a guest at your house. But you can be damn sure I'd tell everyone you can't make Mac n cheese and I definitely wouldn't trust you with dinner ever again.

You start with a roux add a little milk then cheese then milk and again cheese. Keep doing that until it's cheesey/creamy enough. Good idea to add salt and some seasonings as well.