Spray the crock of a slow cooker with non-stick cooking spray.
Place a large skillet over medium heat. Once hot, cook the ground beef until browned and no longer pink, breaking up the meat as it cooks. Drain the excess grease and transfer the beef to the slow cooker.
Add the onion, garlic, strained tomatoes, diced tomatoes, kidney beans, black beans, chili powder, salt, cumin, paprika, and oregano. Stir to combine.
Cover and cook on LOW for 6-8 hours.
Stir and then portion into bowls. Top with shredded cheddar and diced white onion for garnish.
Notes
Nutritional information if for chili only, without toppings.