I made this tonight for dinner and used some of the other posts variations. I didn't use an egg and I added 1/4 cup cream of mushroom soup and about 2 tablespoons sour cream in place of heavy cream (didn't have it on hand).

I couldn't believe how much it tasted like real mac n' cheese!! It's really filling too. One serving was enough for me. I have a lot left over.

Thank you!