Creating Garlic Butter Beef Pasta is simple and straightforward. Follow these steps for a delicious meal:

1. Cook the Pasta: In a large pot, bring salted water to a boil. Add the fettuccine or spaghetti and cook according to package instructions until al dente. Reserve 1 cup of pasta water, then drain and set aside.
2. Sauté the Beef: In a large skillet over medium-high heat, melt 2 tablespoons of butter. Add the sliced beef, seasoning with salt and pepper. Sauté for about 3-4 minutes until browned. Remove the beef from the skillet and set aside.
3. Make the Garlic Butter Sauce: In the same skillet, add the remaining 2 tablespoons of butter. Once melted, add the minced garlic and red pepper flakes (if using). Sauté for about 1-2 minutes until fragrant, being careful not to burn the garlic.
4. Combine Ingredients: Return the cooked beef to the skillet with the garlic butter. Toss to coat the beef in the sauce. Add the drained pasta and about ½ cup of the reserved pasta water. Stir well to combine, adding more pasta water if needed to create a silky sauce.
5. Adjust Seasoning: Taste and adjust the seasoning with additional salt and pepper as needed.
6. Serve: Remove from heat, and sprinkle with chopped parsley and grated Parmesan cheese before serving.

These steps will guide you in creating a truly remarkable dish that will leave your taste buds dancing with delight!