01 - Bring a large pot of salted water to a boil. Cook tortellini according to package instructions until tender. Drain well and set aside.
02 - Pat steak pieces dry with paper towels. Season generously with salt and freshly ground black pepper on all sides.
03 - Heat olive oil in a large skillet over medium-high heat until shimmering. Add steak pieces in a single layer without overcrowding. Sear for 2 to 3 minutes per side until a deep golden-brown crust forms and steak reaches desired doneness. Transfer to a plate and tent loosely with foil.
04 - Reduce heat to medium. Add butter to the same skillet and allow it to melt. Sauté shallots and garlic, stirring frequently, until softened and fragrant, about 1 minute. Avoid browning the garlic.
05 - Pour heavy cream into the skillet, scraping up any browned bits from the bottom. Stir to combine and bring to a gentle simmer. Cook for 2 to 3 minutes, allowing the sauce to reduce and thicken slightly.
06 - Stir in grated Parmesan cheese, continuing to stir until fully melted and the sauce is smooth and velvety.
07 - Return the cooked tortellini and seared steak to the skillet. Toss gently to coat everything evenly in the garlic cream sauce. Cook for 1 to 2 minutes until heated through.
08 - Transfer to serving plates and sprinkle generously with chopped fresh parsley. Serve immediately while hot.