Brown the beef: In a skillet over medium heat, cook the ground beef until browned, breaking it up as it cooks. Drain excess grease if needed.
Prepare the slow cooker: Coat the inside of your slow cooker with a light layer of cooking spray or oil.
Add aromatics: Place the chopped onion and minced garlic in the slow cooker.
Add ingredients: Add the browned beef, diced potato, corn, mixed vegetables, pinto beans, black beans, diced tomatoes, tomato sauce, seasonings and beef broth. Adjust the broth to cover the ingredients slightly. (About 6 cups)
Mix: Mix everything until combined.
Cook: Cover and cook on low for 6–8 hours or high for 3–4 hours, until the potatoes and vegetables are tender.
Garnish and serve: Taste and adjust seasoning if needed. Serve hot, garnished with chopped fresh parsley if desired.