This recipe should be ~2/3 meat, ~1/3 vegetarian. All instructions are the same except for the first step of cooking the beef.

Chop the onions, and saute in a large pot or do this step separately in a large pan if that makes cooking the beef easier. Add ground beef to the onions and brown. Transfer to a large pot.

In a separate large pot, saute the onions for the vegetarian pot.

Quarter the zucchini lengthwise and cut into ½ inch pieces. Add to meat pot and to veggie pot.
Add tomato puree, diced tomato, black beans, kidney beans, corn, chili powder, and taco seasoning to each pot.

Simmer on low for 30 mins to 1 hour.

The seasoning is important, so make sure the chili tastes good before serving. Add more seasoning as you see fit :)

Serve with sour cream and shredded cheese. Bring out hot sauce for people who might want it.