Cook the Beef: In a skillet over medium heat, brown the ground beef until fully cooked, breaking it apart with a spoon. Drain any excess fat.
Prepare the Slow Cooker: Add the cooked beef, kidney beans, black beans, diced tomatoes, tomato paste, broth, onion, bell pepper, garlic, and spices to the slow cooker. Stir to combine.
Cook: Cover and cook on low for 6-8 hours or on high for 3-4 hours. Stir occasionally if you’re at home.
Taste and Adjust: Taste the chili before serving and adjust the seasoning with salt, pepper, or chili powder as needed.