Introduce the ground beef to the pot. Use a spoon to stir and crumble it until browned with no pink visible, which should take about 5 to 7 minutes.
Add the diced tomatoes with their juices, then toss in the Parmesan rinds, Italian seasoning, and broth. Season lightly with salt and pepper, and bring it to a gentle boil.
Once it reaches a boil, reduce the heat and cover. Allow it to simmer for 25 to 30 minutes, letting the flavors meld together beautifully.
Fold in the zucchini noodles and let them cook for just 1 to 2 minutes until they soften slightly, ensuring they remain tender and not mushy.
After cooking, remove and discard the Parmesan rinds. Ladle the soup into bowls and top with chopped parsley or basil for a fresh touch. Enjoy your warm soup!