Start by seasoning your steak strips with salt, pepper, garlic powder, and dried rosemary. Heat the olive oil in a skillet over medium-high heat, add the steak, and cook until browned and cooked to your preferred doneness (about 3–5 minutes per side). Remove the steak from the skillet and set it aside to rest.
Meanwhile, bring a large pot of salted water to a boil, add the fettuccine, and cook according to package instructions until al dente. Drain the pasta, reserving a little pasta water in case you need to loosen the sauce later.
In the same skillet used for the steak, reduce heat to medium and add butter and minced garlic. Sauté until fragrant (about 1 minute), then pour in the heavy cream and bring to a gentle simmer. Gradually whisk in the Parmesan until smooth and melted, then stir in the Gorgonzola until the sauce becomes creamy and well-combined. Add nutmeg, salt, and pepper to taste.
Add the drained pasta directly into the skillet with the cheese sauce and toss well so every strand is coated. Return the rested steak slices to the skillet and gently fold them into the pasta and sauce until everything is warmed through and evenly combined.
Plate the pasta and steak immediately, and garnish with extra crumbled Gorgonzola, chopped parsley, and a touch of freshly ground black pepper for a restaurant-style finish.