In a large skillet over medium-high heat, brown the ground beef until no pink remains, breaking it into small crumbles to develop a savory crust.
Drain any excess fat from the skillet and transfer the browned beef into the base of your slow cooker.
Add the diced yellow onion, green bell pepper, and minced garlic directly over the beef for a layer of aromatic flavor.
Pour in the red kidney beans, tomato puree, diced tomatoes, and beef bone broth, stirring to ensure the beef is well-submerged.
Sprinkle in the chili powder, smoked paprika, ground cumin, sea salt, and black pepper, then toss everything together until the spices are evenly distributed.
Set the slow cooker to low for 6 to 8 hours, allowing the smoky flavors to meld and the beef to become incredibly tender.
Ladle the hot chili into bowls and enjoy the comforting, deep flavors of this clean-eating classic.