Bring a pot of salted water to a boil and cook pasta shells until al dente. Drain them, reserving about ½ cup of pasta water to adjust the sauce’s consistency later.
Melt butter in the same pot over medium heat, then sauté garlic for 30 seconds. Stir in cream and grated Parmesan until smooth, tossing the pasta in the sauce and adding reserved pasta water if needed for a silky texture.
Pat steak cubes dry and season with salt and pepper. Heat olive oil in a skillet over high heat, then sear steak 2–3 minutes per side until medium-rare. Remove from pan.
Lower heat to medium, add butter, garlic, herbs, and Worcestershire sauce. Stir until a glossy sauce forms, then return steak bites to the pan and toss to coat evenly.
Plate creamy pasta shells and top with steak bites. Garnish with fresh parsley and a sprinkle of extra Parmesan for a restaurant-quality presentation.