Boil rotini pasta in salted water until al dente. Drain and set aside.
Heat olive oil in a skillet over medium-high heat. Sear steak slices until browned. Season with salt and pepper. Remove and set aside.
In the same skillet, melt butter. Stir in ranch seasoning and heavy cream. Simmer until slightly thickened, then add cheddar and Parmesan cheese. Stir until smooth.
Mix cooked pasta and steak into the sauce. Transfer to a greased baking dish.
Preheat oven to 375°F (190°C). Bake for 15 minutes until bubbly. Garnish with parsley before serving.
