Step 5: Make the Sauce: Pour in the 1 cup heavy cream and 1/2 cup beef broth, stirring to combine and scraping up any browned bits left from the steak. Let the mixture come to a gentle simmer, and cook for 3-4 minutes until the sauce slightly thickens.
Step 6: Add Cheese: Stir in the 1/2 cup grated Parmesan cheese until fully melted and the sauce is creamy and smooth.
Step 7: Combine and Serve: Add the cooked pasta shells and steak pieces back to the skillet. Gently toss everything together until the pasta and steak are evenly coated in sauce. Remove from heat, sprinkle with chopped fresh parsley, and serve piping hot.
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