01 - Remove steak from refrigerator 20 minutes before cooking. Pat thoroughly dry with paper towels and season all sides generously with salt and cracked black pepper.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Sear steak for 3–4 minutes per side until medium-rare or desired doneness is achieved. Transfer to a plate, tent loosely with foil, and let rest for at least 5 minutes.
03 - Bring a large pot of salted water to a rolling boil. Cook tortellini according to package directions until al dente. Reserve 1/4 cup of pasta cooking water, then drain thoroughly.
04 - In the same skillet, wipe out excess oil while retaining browned bits. Melt butter over medium heat. Add cracked garlic and shallot; sauté for 2–3 minutes until fragrant and translucent, being careful not to burn the garlic.
05 - Pour in heavy cream, chicken broth, and add Parmesan, Italian seasoning, red pepper flakes, salt, and black pepper. Simmer for 3–4 minutes, stirring frequently, until sauce slightly thickens and cheese melts completely.
06 - Slice the rested steak thinly against the grain to ensure tenderness.
07 - Add cooked tortellini and reserved pasta water to the skillet with the sauce. Toss gently to coat all pasta evenly.
08 - Fold in sliced steak, fresh parsley, and lemon zest. Taste and adjust seasoning as needed. Serve immediately, garnished with additional Parmesan and cracked black pepper.