How do I thicken macaroni and cheese?

Answer 1

If you have added too much liquid to mashed potatoes a "quick fix" is to add a couple of tablespoons of instant mashed potato flakes. If you add another cooked root vegetable to the pot you will alter the flavour but get a better consistency. (try carrots, parsnips, turnip, or sweet potato - just do not add any more liquid)

You could also: Add an egg and stir for 5 minutes. Repeat until desired consistency is reached.

Answer 2

More cheese, less water. Consider light use of milk or butter try adiing a little flour to the egg and milk when mixing.