Boil a large pot of salted water and cook the fettuccine until al dente.
Season the steak with salt and pepper, then heat olive oil in a skillet.
Sear the steak for 4-5 minutes on each side for medium-rare, then let it rest.
In the same skillet, sauté minced garlic until fragrant.
Add heavy cream and stir to combine.
Mix in grated Parmesan cheese until melted and smooth.
Slice the rested steak against the grain.
Combine the drained pasta with the sauce and sliced steak.
Garnish with fresh parsley and optional red pepper flakes before serving.