In a large pot, brown the ground beef over medium heat.
Add the onion, garlic, and bell pepper and cook until softened.
Stir in the diced tomatoes, tomato sauce, kidney beans, chili powder, cumin, paprika, cayenne pepper, salt, and pepper.
Simmer the chili for 2 hours, stirring occasionally.
Serve hot, garnished with shredded cheese and chopped onions.