buy a regular box of macaroni & cheese. and prepare it on the stovetop as directed.
next, add one can of either mushroom soup or cream of chicken soup (don't add water). you can also add a can of chunk chicken, too.
put it all into a square aluminum baking pan, pop it into the oven, & bake it for approx. 45 minutes.
baking it lets all the flavors mix in together, & greatly improves the texture--
and it doesn't take a lot of kitchen know-how :)