Brown the beef, onion and bell pepper in a skillet over medium-high heat for 9 to 10 minutes, crumbling the meat until it reaches 160°F.
Drain the fat and cook the garlic and chili powder with the beef for 30 seconds.
Transfer the mixture to a 6-quart crockpot and stir in the tomato sauce, diced tomatoes, beans, ketchup, mustard, Worcestershire, brown sugar and salt.
Cover and cook on low for 5 to 6 hours until the peppers are very soft and the sauce clings to the crumbles.
Stir thoroughly and cook uncovered on high for 15 minutes if the chili is loose enough to run off a spoon.