In a skillet, brown ground beef and chopped onions. Drain and transfter to slow cooker.
Add remaining ingredients to slow cooker (except spaghetti noodles) and stir to combine. Cook on low for 4-6 hours.
15 minutes before serving, cook spaghetti noodles according to package and prepare the toppings.
Serve hot chili over hot spaghetti noodles and to with cheese, onions, and crackers.
Enjoy!