Creating Creamy Spicy Garlic Butter Steak Pasta is a simple process. Follow these steps to ensure a delicious outcome:

1. Cook Pasta: In a large pot of boiling salted water, cook the fettuccine or spaghetti according to package instructions until al dente. Reserve ½ cup of pasta water, then drain and set aside.
2. Prepare Steak: Season the sliced flank steak with salt and pepper. In a large skillet over medium-high heat, melt 2 tablespoons of butter. Add the steak and cook for 2-3 minutes until browned. Remove the steak from the skillet and set aside.
3. Create Sauce: In the same skillet, melt the remaining 2 tablespoons of butter. Add the minced garlic and red pepper flakes, cooking for about 1 minute until fragrant.
4. Add Cream: Pour in the heavy cream, stirring to combine. Bring the mixture to a gentle simmer.
5. Incorporate Cheese: Stir in the grated Parmesan cheese until melted and smooth. If the sauce is too thick, add reserved pasta water a little at a time until desired consistency is reached.
6. Combine Ingredients: Add the cooked pasta and steak back into the skillet. Toss everything until well coated with the creamy sauce. Season with additional salt and pepper if needed.
7. Serve Hot: Remove from heat and garnish with fresh parsley before serving.

Following these steps will lead you to a delightful plate of Creamy Spicy Garlic Butter Steak Pasta that you and your loved ones will enjoy.