In a large pot over medium-high heat, warm up broth. Add onion, bell pepper, and garlic, stirring until the vegetables soften. Then, add ground beef. Using a wooden spoon, gently break down beef until it is in small pieces and cooked through. Stir in spices, beans, and tomatoes.
¼ cup beef broth, 1 onion, 1 bell pepper, 2 cloves garlic, 1 pound extra lean ground beef, 2 teaspoons dried oregano, 1 teaspoon dried cumin, 1 Tablespoon chili powder, ½ teaspoon ground black pepper, ½ teaspoon cayenne pepper, 14 ounce pinto beans, 14 ounce black beans, 28 ounce diced tomatoes