Creating Cajun Garlic Butter Sauce is straightforward if you follow these simple steps:

1. Melt Butter: In a medium saucepan, melt the unsalted butter over low heat.
2. Add Garlic: Once the butter is melted, add the minced garlic, and sauté for about 2 minutes until fragrant. Be careful not to let it brown.
3. Incorporate Spices: Stir in the Cajun seasoning and red pepper flakes to the garlic butter. Mix well to combine.
4. Season: Taste the sauce and season with salt and pepper if needed.
5. Optional Lemon Juice: If desired, squeeze in fresh lemon juice to brighten the flavor; mix thoroughly.
6. Remove from Heat: Turn off the heat and let the sauce sit for a couple of minutes to blend the flavors.
7. Garnish: Just before serving, sprinkle with fresh chopped parsley for a fresh touch.

This simple preparation will yield an incredible sauce that enhances the flavor of any dish.