Heat the olive oil in a large stockpot over medium-high heat. Add the ground beef and cook until browned, breaking it apart as it cooks. Drain the excess grease.
Sprinkle the onion soup mix over the beef. Cook for 2 to 3 minutes, stirring as it toasts and blooms.
Pour in the stewed tomatoes with liquid. Using a firm spatula, wooden spoon, or kitchen scissors, break up and chop the tomatoes into smaller, bite-size pieces.
Add the mixed vegetables, beef broth, and water. Bring to a boil, then lower the heat and simmer for 20 minutes.
Add the pasta and gently boil until just al dente, about 5 to 7 minutes. Remove from the heat. The pasta will continue to soften in the hot soup, so be careful not to cook it too long.
Taste and season with salt and black pepper before serving. I like to top my bowl with shredded cheddar cheese.