Brown the ground venison and chopped onion in a large pan or a large dutch oven over medium heat. Add in a tablespoon of butter or olive oil for extra fat if you want to. Do NOT drain. Venison is lean and doesn't have extra fat.
Stir in the garlic and cook for about 1 minute.
Add the 2 cans of ire-roasted tomatoes, 1 can chili beans, 1 can black beans, 1 can tomato paste, 1 can green chilies, and 1 small bag of frozen corn. Stir.
Sprinkle in the 2 packets of taco seasoning and pour in the 2-3 cups of beef broth. Season with salt and pepper. Stir well to combine.
Let it cook over medium heat until heated through. About 15 minutes. That's it!