Season the steaks generously with salt and pepper. Heat a skillet over medium-high heat and sear the steaks until golden brown. Cook to medium (145–155°F) or your preferred doneness, then let rest under foil.
Cook fettuccine in salted water until al dente. Drain and set aside. This ensures the pasta holds its texture when mixed with the creamy sauce.
In the same skillet, melt the remaining butter and add heavy cream. Stir in parmesan until smooth, then season with salt and pepper. Simmer gently for 5 minutes to thicken slightly.
Toss the cooked pasta in the sauce until fully coated. Slice the rested steak and place it over the pasta. Add extra parmesan or herbs if desired for a gourmet touch.