Add 2 soup cans of water. Simmer for 30 minutes or so to let the flavors have time to meld. Taste and adjust seasonings. Serve with crusty garlic bread. (Although it is great with corn bread too.)
Even better the next day.
For a richer flavor, use beef broth instead of water. The leftovers will thicken; just add water to desired consistency.
If you want to extend it - dump in more cans. Sometimes I add a can of whole kernal corn or a can of green beans. (In the above photo I had added half a can of corn and half a can of black beans left over from a taco salad the previous day.)
My Mom likes it with 2 cans of ranch style beans and some people prefer the spicy Rotel.
You can add tobasco at the table or stir in some red pepper flakes.
Chris adds japalenos. Modifications are limitless.
As written above it is approximately 130 calories per one cup serving. Change things and you'd have to recalculate.