In a large pot over medium heat, add the ground beef and cook until browned, about 5 minutes.

Drain excess fat if necessary.

Add the diced onion, bell pepper, and minced garlic to the pot.

Cook until the vegetables are softened, about 5 minutes.

Stir in the diced tomatoes, tomato paste, beef broth, kidney beans, black beans, chili powder, cumin, salt, and black pepper.

Bring the mixture to a boil.

Reduce heat to low and let simmer for 20 minutes, stirring occasionally.

Adjust seasoning if necessary.

Serve hot, garnished with your choice of toppings such as cheese, sour cream, or green onions.