I wasn't convinced that "old-fashioned" included a can of cheddar cheese soup, but the recipe said "The introduction of Campbell's Cheddar Cheese Soup helped to put macaroni and cheese on the culinary map," and that sounds like it could be true, so now I don't know what to believe.
It never would have occurred to me to put onions in macaroni and cheese, but man. . .it was weirdly good!
This recipe is super-simple, and great with a green salad. You don't even have to add the onions if you don't want to! The only thing about it was, there were no spices in the recipe, so I would recommend having salt, pepper, and maybe cayenne pepper on standby.
Old-Fashioned Macaroni and Cheese
From The Soup Mix Gourmet
1 Tbsp. butter
1/4 cup chopped onion (I love cooked onions, so I used the whole thing. Whatever you want!)
1 can Campbell's Condensed Cheddar Cheese Soup
1/2 cup milk
3 cups cooked macaroni
Salt, pepper, cayenne pepper to taste (Optional)
Melt the butter in a large pan over medium heat.
Cook the onion until it is softened.
Stir in the soup, then add the milk, gradually and while stirring. Mix in the cooked macaroni and cook until heated through.
Add whatever seasonings you want. And. . .done!