Bring a large pot of salted water to a rolling boil. Add pasta shells and cook until al dente, about 8-10 minutes. Drain and set aside.

In a large skillet, heat over medium heat. Add ground beef, chopped onion, and minced garlic. Cook for about 5-7 minutes until beef is browned and onions are translucent.

Stir in beef broth and Italian seasoning. Bring to a gentle simmer and cook for about 5 minutes to meld the flavors.

Reduce heat to low and pour in heavy cream, mixing well. Simmer gently for another 5 minutes until slightly thickened.

Fold cooked pasta shells into the creamy beef mixture, ensuring each shell is well-coated. Adjust seasoning with salt and pepper if needed.

Serve the creamy beef and shells garnished with extra Italian seasoning if desired.