01 - Bring a large pot of salted water to a boil. Cook the cheese tortellini according to package instructions until tender. Drain through a strainer and set aside.
02 - Pat the steak pieces dry and season generously with salt and freshly ground black pepper. Heat olive oil in a large skillet over medium-high heat until shimmering. Add the steak pieces in a single layer and sear for 2 to 3 minutes per side until deeply browned and cooked to your preferred doneness. Remove the steak from the skillet and set aside on a plate.
03 - Reduce the heat to medium. Add the unsalted butter to the same skillet. Once melted and foaming, sauté the chopped shallots and minced garlic, stirring frequently, until fragrant and softened, about 1 minute.
04 - Pour in the heavy cream, stirring well to scrape up any browned bits from the bottom of the pan. Bring the mixture to a gentle simmer and cook for 2 to 3 minutes, allowing the sauce to reduce and thicken slightly.
05 - Stir the grated Parmesan cheese into the simmering cream sauce, continuing to stir until fully melted and the sauce is smooth and glossy.
06 - Return the cooked tortellini and seared steak pieces to the skillet. Toss gently to coat everything evenly in the garlic cream sauce. Cook for 1 to 2 minutes until heated through. Sprinkle with chopped fresh parsley and serve immediately.