Creating Creamy Beef and Shells is straightforward if you follow these simple steps:

1. Cook the Pasta: In a large pot of salted boiling water, cook the medium shell pasta according to package instructions until al dente. Drain and set aside.
2. Brown the Beef: In the same pot, heat the olive oil over medium heat. Add the ground beef, breaking it apart with a spoon. Cook until browned, about 5-7 minutes.
3. Add Onions and Garlic: Incorporate the chopped onion and minced garlic into the pot. Sauté until the onions are translucent, approximately 3-4 minutes.
4. Pour in Broth: Add the beef broth and bring to a simmer. Let it cook for about 5 minutes to deepen the flavors.
5. Add Cream: Stir in the heavy cream and Italian seasoning. Allow it to thicken slightly, cooking for another 3-5 minutes.
6. Combine with Pasta: Fold the cooked shells into the creamy beef mixture until well combined.
7. Sprinkle Cheese: Gradually add the shredded cheddar cheese, stirring until melted and the dish is creamy and cohesive.
8. Season: Taste and adjust with salt and pepper as needed.
9. Serve: Remove from heat, dish out into bowls, and garnish with fresh parsley.

These straightforward instructions will guide you toward making this incredible meal effortlessly.