Heat olive oil in a large pot over medium-high heat. Add steak strips, season with salt and pepper, and cook until browned on all sides. Remove steak and set aside.
In the same pot, melt butter and sauté garlic with red pepper flakes until fragrant.
Pour in beef broth and cream. Bring to a gentle boil.
Add pasta directly to the pot. Stir to coat and let it cook until al dente, stirring occasionally.
Stir in parmesan cheese and return steak to the pot. Toss everything until creamy and well combined.
Serve warm, topped with fresh parsley.