Bring a large pot of salted water to a boil and cook fettuccine until al dente according to package instructions.
Season steak strips with salt and pepper.
Heat olive oil in a large skillet over medium-high heat and sear steak until browned, approximately 2-3 minutes per side, then remove and set aside.
Reduce heat to medium and melt butter in the same skillet.
Add minced garlic and sauté for 60 seconds until fragrant.
Whisk in heavy cream and simmer for 4 minutes until the liquid reduces slightly.
Slowly whisk in Parmesan cheese until the sauce is smooth and thickened.
Add the cooked pasta and steak strips to the skillet and toss to coat thoroughly.
Garnish with chopped parsley and serve immediately.