Start by heating up a pan over medium heat and adding 4 tablespoons of unsalted butter. Allow the butter to melt completely. When the butter has melted, add 1 teaspoon of garlic powder and cook for 4-5 seconds. (Alternatively, you can use 6-7 cloves of roasted garlic for a deeper flavor, as suggested in the article above.) Lower the heat to low and add 2 tablespoons of all-purpose flour to the pan. Cook and constantly stir for about a minute until the flour is lightly browned. Slowly pour in 1 cup of whole milk while constantly whisking to prevent lumps from forming. Add 1 cup of low-sodium chicken broth and keep cooking until the sauce reaches the desired thickness. Lastly, stir in 1/2 cup freshly grated parmesan cheese, 1/3 teaspoon salt, and 1/4 teaspoon freshly ground black pepper. Cook until the parmesan cheese has fully melted and is well mixed with the sauce. Serve the sauce on top of pasta, vegetables, or any other dish you like.