01 - Bring a large pot of salted water to a boil. Cook the cheese tortellini according to package directions until tender. Drain well 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-brown crust forms and the meat reaches your preferred doneness. Transfer to a plate and rest.
03 - Reduce the skillet heat to medium. Add the butter and let it melt, scraping up any browned bits from the bottom. Sauté the minced garlic and shallots for about 1 minute until fragrant and softened, taking care not to let the garlic brown.
04 - Pour in the heavy cream, stirring to deglaze the pan. Bring to a gentle simmer and cook for 2–3 minutes, stirring occasionally, until the sauce coats the back of a spoon.
05 - Stir in the grated Parmesan cheese and continue stirring until fully melted and the sauce is silky smooth.
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.