4. Make the Creamy Sauce:
Pour in the beef broth and diced tomatoes (drained) into the pan with the beef. Stir to combine, and bring to a simmer.
Let the mixture simmer for about 5 minutes to reduce slightly.
Lower the heat and add the heavy cream, stirring until the sauce is smooth and creamy.
5. Combine the Pasta and Beef Sauce:
Add the cooked pasta shells into the skillet with the beef and sauce, stirring gently to coat the pasta evenly with the creamy mixture.
If you’re using mozzarella cheese, sprinkle it over the top and stir it in until melted and creamy.
6. Serve:
Once the pasta is well combined with the creamy beef sauce, remove from heat.
Serve the Creamy Beef and Shells in bowls, garnishing with grated Parmesan cheese and fresh basil or parsley if desired.