Preheat the oven to 375 degrees Fahrenheit.
Heat the avocado oil in a large skillet over medium-high heat. Add the chopped onion and sauté for 3 to 5 minutes, or until the onion has softened. Add the ground beef and use a spatula to chop it into small bits. The ground beef doesn’t need to be cooked all the way through just yet, but cook it until much of it has browned. Sprinkle lightly with sea salt.
Transfer the bell pepper, garlic, chili powder, chicken broth, salsa, white rice, black beans, green chiles and salt to a large 13” x 9” casserole dish. Stir everything well until combined.
Stir in the ground beef mixture, followed by half of the cheese.
Cover the casserole dish with aluminum foil and bake for 45 minutes. Remove the baking dish from the oven and remove the foil.
Place the oven on the High Broil Setting and sprinkle the casserole with the remaining cheese.
Broil for 5 to 8 minutes or until the cheese has melted and has turned slightly golden brown.
Serve casserole in individual servings with your choice of toppings such as sliced avocado or guacamoles, corn chips, sour cream, salsa, lettuce, chopped tomatoes, olives, pico de gallo, extra shredded cheese, etc. You can also serve with flour tortillas or corn tortillas so that people can make tacos or burritos out of the casserole.