Cook tortellini according to package instructions, drain, and set aside.
Season steak cubes with salt and black pepper.
Heat olive oil in a large skillet over medium-high heat.
Sear steak pieces for 2–3 minutes per side until browned, then remove and set aside.
In the same skillet, melt butter and sauté garlic until fragrant.
Pour in beef broth and heavy cream, stirring to combine.
Add Parmesan cheese and Italian seasoning, simmer until sauce thickens.
Return steak and cooked tortellini to the skillet and toss to coat evenly.
Garnish with chopped parsley and serve warm.