Creating Beef and Garlic Butter Pasta is straightforward if you follow these simple steps:

1. Cook the Pasta: In a large pot, bring salted water to a boil. Cook the spaghetti according to package instructions until al dente. Drain and set aside, saving about ½ cup of pasta water.

2. Prepare the Beef: While the pasta cooks, season the thinly sliced beef with salt, black pepper, and red pepper flakes if using.

3. Heat the Oil: In a large skillet, heat olive oil over medium-high heat. Once hot, add the seasoned beef in a single layer.

4. Sear the Beef: Cook for 2-3 minutes on each side until browned. Remove from the skillet and set aside, covering to keep warm.

5. Make the Garlic Butter: In the same skillet, lower the heat to medium. Add the unsalted butter and let it melt. Add the minced garlic and sauté until fragrant but not browned, about 1-2 minutes.

6. Combine Pasta and Beef: Return the beef to the skillet, followed by the cooked pasta. Toss everything together, adding reserved pasta water a tablespoon at a time until a smooth sauce forms.

7. Adjust Seasoning: Taste and adjust the salt and pepper as needed.

8. Serve Immediately: Plate the pasta and top with fresh chopped parsley and grated Parmesan cheese.

These straightforward steps will guide you in creating this incredible dish effortlessly, promising a delightful meal that you and your family will cherish.