Using a deep skillet, brown the ground beef until no pink is visible. If there is an excessive amount of grease, drain it off using a strainer. Place the beef back into the skillet.
Add the diced bell pepper, onion, and garlic into the skillet with the meat and saute for 3-5 minutes. There should still be enough grease from the ground beef to help with the saute process.
Place the cubes of Velveeta cheese into the skillet. Then gently pour in the beef broth and milk. Stir until the Velveeta cheese is almost melted through.
Stir in the diced tomatoes, and gently pour the elbow macaroni into the skillet and combine well.
Next add all of the seasonings into the dish, and stir until it is mixed. Cover and cook on medium-low until the macaroni is al dente (soft but not soggy)! about 15 minutes.
Turn the heat off, sprinkle cheddar cheese over the top, and cover until the cheese melts. There will be a bit of liquid remaining, but it will thicken as it cools.