In a frying pan over medium-high cook beef and onion until brown and cooked thoroughly.
Stir in minced garlic and cook 1-2 minutes, until fragrant.
In the crock of the Crock-Pot add garlic, pumpkin puree, crushed tomatoes, tomato sauce, diced tomatoes, chili beans, spices, vinegar, and brown sugar and mix well.
Stir in cooked meat and onion.
Cook on low for 4-6 hours or on high for 2-3 hours on low, stirring occasionally.