Cut steak into bite-sized cubes and season with salt, pepper, and Italian seasoning.
Heat olive oil in a skillet over high heat and sear the steak until browned and cooked to desired doneness. Remove and set aside.
Cook tortellini according to package instructions, then drain and set aside.
In the same skillet, melt butter and sauté minced garlic until fragrant.
Add heavy cream and let it simmer gently for 3–4 minutes.
Stir in Parmesan cheese until the sauce thickens and becomes creamy. Season with salt and pepper.
Add cooked tortellini to the skillet and toss to coat evenly in the sauce.
Return steak bites to the skillet and mix everything together.
Heat through for 2–3 minutes and garnish with parsley before serving.