Heat the oil in the Rockcrok® Dutch Oven over medium heat for 3–5 minutes, or until shimmering.
Finely dice the onion. Add the onion to the Dutch oven. Cook and stir, uncovered, for 2–3 minutes, or until the onion is slightly softened.
Add the ground beef and pressed garlic. Cook over medium heat for 8–10 minutes, breaking the beef into crumbles as it cooks. When the beef is no longer pink, drain (if necessary).
Stir in the remaining chili ingredients. Cover and place the Dutch oven in the Rockcrok® Digital Slow Cooker Stand and cook on LOW for 8 hours or HIGH for 4 hours.
Serve topped with green onion, sour cream, cheddar cheese, or jalapeño slices, if desired.