Heat olive oil in a skillet over medium-high heat.
Season steak bites with salt and black pepper.
Sear the steak in batches until browned and cooked to desired doneness. Remove and set aside.
Reduce heat to medium, add butter and garlic, and sauté until fragrant.
Pour in heavy cream, Parmesan cheese, and Italian seasoning. Stir until creamy and smooth.
Return steak bites to the skillet, tossing to coat in the sauce.
Garnish with chopped parsley and serve immediately.