This was a simple, cheap, and delicious meal.
First I cooked up a 1 lb bag of dry beans using Suzi's "crockpot bean recipe."
Once cooked, I drained the beans and put them in a large saucepan. I added:
1 can diced tomatoes (with juices)
1/2 diced onion (previously sauted with butter and garlic)
optional: 1 small can of diced green chiles
Simmer beans on stovetop for 15-20 minutes.
Then, in individual bowls, place a handful of fritos, a large scoop of the beans, and sprinkle with shredded cheddar. Put bowl in microwave for a few seconds to melt the cheese. Top with sour cream.