Pre-heat the dutch oven or stockpot over medium heat for 1-2 minutes. Add the minced onion and ground beef and cook until no pink remains, breaking up the meat with a cooking spoon.
Add the beef broth, diced tomatoes, tomato sauce, drained kidney beans, elbow macaroni, garlic, chili powder, and cumin to the pot and stir well to combine.
Bring to a simmer, then cover the pot and cook for 12-13 minutes, or until pasta is tender. Uncover the pot and continue cooking for another 3-4 minutes, stirring frequently. By now, most of the liquid should be absorbed.
Turn off the heat. Add 1 cup shredded cheddar cheese to the pot and stir to mix it in.
Sprinkle the remaining cup of shredded cheese over the top of the Chili Mac and cover with the lid for 2-3 minutes to melt it.
Top with desired toppings (cilantro, diced tomato, diced red onion) and serve. Enjoy!