Cook fettuccine in a large pot of salted boiling water until al dente. Reserve 1/2 cup of pasta water before draining.
Season steak strips with salt and pepper.
Heat olive oil in a large skillet over medium-high heat. Sear steak strips for 2-3 minutes per side until browned. Remove steak from skillet and set aside.
Reduce heat to medium. In the same skillet, melt butter and sauté minced garlic for 1 minute until fragrant.
Pour in heavy cream and bring to a gentle simmer, whisking constantly.
Whisk in Parmesan cheese and dried parsley until the sauce thickens.
Add the cooked fettuccine to the skillet and toss to coat. Use reserved pasta water if the sauce is too thick.
Incorporate the steak strips back into the pasta and serve immediately.