01 - Bring a large pot of salted water to a boil. Add the tortellini and cook according to package directions until al dente. Drain well in a colander and set aside.
02 - Pat the steak cubes dry and season generously with salt and black pepper. Heat olive oil in a large skillet over medium-high heat. Add the steak in a single layer and sear for 2 to 3 minutes per side until deeply browned. Transfer the steak to a plate and set aside.
03 - Reduce the skillet heat to medium. Add the butter, chopped shallots, and minced garlic. Sauté for about 1 minute, stirring constantly, until the aromatics are softened and fragrant.
04 - Pour the heavy cream into the skillet, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Bring the liquid to a gentle simmer and cook for 2 to 3 minutes, allowing the cream to reduce and thicken slightly.
05 - Stir the grated Parmesan cheese into the simmering cream. Continue to stir constantly until the cheese has completely melted and the sauce is smooth.
06 - Return the cooked tortellini and seared steak pieces to the skillet. Toss everything together gently over medium heat for 1 to 2 minutes, ensuring the pasta and steak are thoroughly coated and warmed through.
07 - Remove the skillet from the heat. Sprinkle the dish with chopped fresh parsley and serve immediately while hot.