It's close to being Keto, but, because I use commercially prepared ketchup and American cheese, I would not consider this cheeseburger soup recipe Keto. However, you can certainly make it keto by using a different cheese and buying or making a keto ketchup. American cheese has about 1 gm of carbs per ounce compared to cheddar that comes in at about 0.4 gm of carbs per ounce. The reason I use the American cheese is because it melts so nicely (due to being processed) and eliminates the need for a flour/butter roux to keep a creamy cheese soup base from splitting. Plus, my go-to cheese on a cheeseburger is always white American cheese; however, you can use any cheese you like!