01 - Remove steak from the refrigerator 20 minutes before cooking. Pat dry thoroughly and season all sides with salt and cracked black pepper.
02 - Heat olive oil in a large skillet over medium-high heat. Sear steak 3-4 minutes per side until medium-rare or desired doneness. Transfer to a plate, tent loosely with foil, and let rest.
03 - Bring a large pot of salted water to a boil. Cook tortellini according to package instructions. Reserve 1/4 cup pasta water before draining.
04 - In the same skillet, melt butter over medium heat. Add cracked garlic and shallot; sauté 2-3 minutes until fragrant and translucent, keeping the browned bits from the steak.
05 - Stir in heavy cream, chicken broth, Parmesan, Italian seasoning, red pepper flakes, salt, and black pepper. Simmer 3-4 minutes, stirring often, until slightly thickened.
06 - Slice the rested steak thinly against the grain for maximum tenderness.
07 - Add cooked tortellini and reserved pasta water to the skillet. Toss gently to coat evenly in the sauce.
08 - Fold in sliced steak, parsley, and lemon zest. Adjust seasoning if needed. Serve immediately, garnished with extra Parmesan and cracked black pepper.