Heat butter in a large pot and sauté garlic and onion until fragrant.
Add steak strips and cook until browned on all sides.
Stir in chili flakes and smoked paprika for a spicy base.
Add pasta, beef broth, and cream directly to the pot. Stir well.
Let it simmer on medium heat until the pasta is tender and the sauce thickens.
Mix in parmesan cheese until creamy and smooth.
Season with salt and pepper as needed. Garnish with parsley before serving.