Grease (or spray) and a 9×13-inch baking dish and set aside.
Place a large skillet or Dutch oven over medium-high heat. When the pan is hot, add the ground beef, onion, and bell pepper. Cook until beef is just barely pink and onions and peppers have softened. About 8 minutes.
Add zucchini, garlic, and taco seasoning. Stir and cook an additional 3-4 minutes or until zucchini is just tender.
Remove from heat and drain excess fat from beef mixture if there is quite a bit. Transfer the meat and veggie mixture to the greased baking dish.
Add the diced tomatoes, tomato paste, beef broth, drained beans, corn, rice, and ½ cup shredded cheese to the baking dish and stir to combine.
Cover the baking dish with foil and bake for 50 minutes or until the rice is tender. Remove the foil and sprinkle remaining cheese over the top and continue to bake for 5-10 minutes or until the cheese is bubbly.
Allow the hot dish to stand for 5 minutes before serving with toppings of choice.
Serving Size:1/8th recipe (without toppings)