In large nonstick skillet over medium-high heat, heat oil. Add onion, bell pepper and garlic and cook, stirring occasionally, until vegetables are slightly softened, about 4 to 5 minutes. Stir in chili powder and cumin. Cook until fragrant, about 15 seconds. Add the beef and cook, stirring and breaking into smaller pieces with a wooden spoon, until no longer pink and the meat starts to brown, about 4 to 5 minutes. Stir in the ketchup, sugar and Worcestershire sauce. Cook, stirring occasionally, until slightly thickened and the beef is cooked through, about 3 to 4 minutes.