To start, in a large pot or dutch oven on medium high heat add a little oil. Toss in the ground beef to brown. Once ground beef is browned season lightly with salt and black pepper.
Next, add in the diced onions and Rotel tomatoes. Add a little more oil if the pot looks dry and it will with lean ground beef.
Now, after the onions have softened add in the tomato paste. While mixing in around in the ingredients cook the paste about 10 seconds before going to the next step.
Then, add in the can of chili beans straight from the can, do not rinse them. Next, add in the corn, black beans and tomato sauce. If you are using a seasoning packet add it in now.
Now, pour in the beef broth. Using something to hold the chilies back, drain the adobo sauce from the can into the pot. Toss in two chilies, more if you like heat or none if you do not. Also, toss in apple cider vinegar now, see tips.
Bring the pot to a boil then lower to a simmer and cover for 20 minutes. Stir occasionally.
Once soup is done serve with fresh lime and crumbled cheese. Avocado is also a great option to add.