Add 1 tsp olive oil and chopped onion to a large pot or dutch oven and place over medium high heat. Cook for about 3 minutes.
Add the ground beef to the pan. Cook on medium – medium high heat until no longer pink – about 5 minutes.
Add the remainder of the ingredients and stir to combine. Turn the heat up to medium high – high and bring to a boil. Then turn down to medium – medium low and let simmer for 20 minutes. Stir occasionally.
Serve with chopped avocado, grated cheddar cheese and sour cream.