Cook the elbow macaroni according to package instructions until al dente. Drain and set aside.
In a large pot, brown the ground beef over medium heat until fully cooked. Drain excess fat.
Add the diced tomatoes, kidney beans, and beef broth to the pot.
Stir in the chili powder, cumin, salt, and pepper.
Bring the mixture to a simmer and cook for 10 minutes.
Add the cooked macaroni to the chili mixture and stir until well combined.
Sprinkle shredded cheddar cheese over the top.
Cover the pot and let the cheese melt for about 5 minutes.
Serve hot, garnished with chopped green onions.