In a large frying pan, saute onion and garlic until soft. Add ground beef: cook and stir until meat is browned. Drain fat.
Transfer to slow cooker. Pour in tomatoes with liquid, salt, pepper, cumin, chili powder, paprika, oregano, and cinnamon. Cover and cook on low for 6 hours.
Serve with toppings of your choice (we like sliced jalapenos and cheese!)
Recipe by Feisty Frugal & Fabulous at https://feistyfrugalandfabulous.com/2018/11/slow-cooker-chili/