Heat oil in a large Dutch oven over medium heat. Add the onion and cook for 3 - 4 minutes.
Add the ground beef and garlic. Cook until meat is no longer pink.
Add cumin and chili powders.
Add tomatoes.
Add beans.
Add the Guinness.
Add brown sugar, cover and simmer for 1 1/2 hours.
Serve with sour cream / Greek yogurt and shredded cheese if desired.
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