I didn't really like this recipe very much, but I did find another in the New Farm Vegetarian Cookbook. Its a kind recipe, although so totally not superhero, but chock-full of vegany yumminess.
boil 3 1/2 cups of water
melt 1/2 cup of earth balance and mix in 1/2 cup of flour to make a roux
pour the boiling water into this mixture ad stir slowly as you do so
add in a few pinches of salt, 1/4 cup of tamari, tablespoon of onion powder, and stir
then add in 1 cup of nutritional yeast and 1/4 cup of safflower oil and stir
pour over a box of macaroni already boiled up
toss in some steamed broccoli or tomatoes if you like. Then pour over 1/2 the cheese sauce and mix thoroughly. Pour the rest over the top and don't mix it in, just smooth it over and put in the oven on 350 for a good 20 to 30 minutes or until the edges bubble. Its the closest I can come to real mac and cheese.