Preheat the oven to 400 F and grease a 9×13″ casserole dish with olive oil.
Using a large pan, preheat to medium heat and add the ground beef and onion. Season and crumble until the ground beef is cooked. Drain the excess fat.
Add the pasta, cooked ground beef, frozen vegetables, chicken broth, tomato sauce, broth, coconut sugar, coconut aminos, and seasonings to the casserole dish. Stir to combine, making sure that the pasta is mostly covered by the liquid.
Cover the casserole dish and transfer to the oven. Allow to bake for 40 minutes.
Remove the cover and stir the pasta. Top with cheese if desired and return to the oven for 4-5 minutes or until the cheese is melted.
Serve topped with chopped green onion.