01 - Bring a large pot of salted water to a boil. Cook the cheese tortellini according to package directions until tender. Drain thoroughly and set aside.
02 - Pat the sirloin 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 in a single layer and sear for 2–3 minutes per side until a golden crust forms and the meat reaches your preferred doneness. Transfer to a plate and rest.
03 - Reduce the skillet heat to medium. Melt the butter, then add the minced shallots and garlic. Sauté for about 1 minute, stirring frequently, until fragrant and softened without browning.
04 - Pour in the heavy cream, stirring to deglaze the pan and lift any browned bits. Bring to a gentle simmer and cook for 2–3 minutes, allowing the sauce to reduce and thicken slightly.
05 - Add the grated Parmesan cheese to the simmering cream, stirring continuously until fully melted and the sauce is smooth and glossy.
06 - Return the cooked tortellini and seared steak to the skillet. Toss gently to coat everything evenly in the garlic cream sauce and heat through for 1–2 minutes. Garnish with chopped fresh parsley and serve immediately.